Use the A-Z list to browse more than 6,000 health-related topics in our library. Clicking on a term opens the definition and, in most cases, links to more information.
"HD" is more commonly referred to as "Hirschsprung's Disease" in the medical community. Hirschsprung's Disease
Also Known As: "Aganglionic Megacolon"
A birth defect where certain nerve cells are lacking in the large intestine preventing it from moving stool through, resulting in intestinal blockage that causes the abdomen to swell. More Information on Hirschsprung's Disease: Pediatric Digestive
"HDL" is more commonly referred to as "High Density Lipoprotein" in the medical community. High Density Lipoprotein
Also Known As: "Cholesterol HDL, Good Cholesterol, HDL Cholesterol"
"Good" cholesterol, HDLs move easily through the blood. They are stable and do not stick to artery walls. They help to prevent heart disease by carrying cholesterol away from the arteries, back to the liver and out of the body. More Information on High Density Lipoprotein: Cholesterol
"HDL Cholesterol" is more commonly referred to as "High Density Lipoprotein" in the medical community. High Density Lipoprotein
Also Known As: "Cholesterol HDL, Good Cholesterol, HDL"
"Good" cholesterol, HDLs move easily through the blood. They are stable and do not stick to artery walls. They help to prevent heart disease by carrying cholesterol away from the arteries, back to the liver and out of the body. More Information on High Density Lipoprotein: Cholesterol
"HDL Test" is more commonly referred to as "Cholesterol Test" in the medical community. Cholesterol Test
Also Known As: "Triglyceride Test, VLDL Test, Total Cholesterol Test, Blood Fat Profile, Lipoprotein Analysis, LDL Test, Lipid Profile"
A group of blood tests that reveal the composition, volume and distribution of the types of fat found in the blood, including cholesterol, triglycerides and lipoproteins. Some tests measure total levels while others measure only one type of fat. More Information on Cholesterol Test: Blood Tests
A liver infection caused by an RNA virus, occurring either simultaneously with hepatitis B or as a superinfection in hepatitis B carriers. It is typically more severe than other forms of hepatitis and is transmitted through sex or blood products. More Information on HDV: Liver, Pancreas & Biliary
Head and neck cancers include a broad category of cancers, many of which are caused by smoking or alcohol abuse. These cancers are much more common in men than women. More Information on Head & Neck Cancers: Head, Neck & Mouth Cancer
"Head Concussion" is more commonly referred to as "Concussion" in the medical community. Concussion
Also Known As: "Cerebral Concussion, Brain Concussion"
A mild type of head injury involving the brain that commonly triggers headaches. The headaches usually resolve with time, but severe headaches may indicate a more serious condition (e.g., hemorrhage). More Information on Concussion: Head & Spine Injury
Head injuries are especially common in children. Most only involve the scalp, which may bleed a lot but usually is not serious. However, internal head injuries, such as damage to the skull or brain, can be quite serious and require medical attention. More Information on Head Injuries & Children: Pediatric First Aid & Safety
Also Known As: "Brain Trauma, Brain Injury, Head Trauma"
Injury to the scalp, skull or brain. These range from mild to potentially life threatening. Associated headaches often resolve with time, but should be reported. Severe headaches may indicate a serious condition (e.g., hemorrhage). More Information on Head Injury: Head & Spine Injury
Also Known As: "Pediculus Humanis Capitis Infestation, Head Louse, Pediculosis Capitis"
Tiny insects that are sometimes found on the human body and which are spread from person to person through close contact. Varieties include head lice, body lice and pubic lice (also called crabs). They often cause intense itching. More Information on Head Lice: Skin Related Infections
Also Known As: "Pediculus Humanis Capitis Infestation, Pediculosis Capitis"
Tiny insects that are sometimes found on the human body and which are spread from person to person through close contact. Varieties include head lice, body lice and pubic lice (also called crabs). They often cause intense itching. More Information on Head Louse: Skin Related Infections
Injury to the scalp, skull or brain. These range from mild to potentially life threatening. Associated headaches often resolve with time, but should be reported. Severe headaches may indicate a serious condition (e.g., hemorrhage). More Information on Head Trauma: Head & Spine Injury
Medications used to relieve or prevent intermittent headaches or chronic headache conditions (e.g., migraines, tension headaches). They may work by blocking pain, reducing inflammation, opening restricted blood vessels or by other methods. More Information on Headache Drugs: Headache & Migraine
As in adults, headaches occurring in children may be classified as primary (not caused by an underlying condition) or secondary (caused by an underlying condition). Due to the age of the patient, however, it may be difficult to determine the cause. More Information on Headache in Children: Headache & Migraine
Also Known As: "Headache Drugs, Headache Medicines"
Medications used to relieve or prevent intermittent headaches or chronic headache conditions (e.g., migraines, tension headaches). They may work by blocking pain, reducing inflammation, opening restricted blood vessels or by other methods. More Information on Headache Medications: Headache & Migraine
Medications used to relieve or prevent intermittent headaches or chronic headache conditions (e.g., migraines, tension headaches). They may work by blocking pain, reducing inflammation, opening restricted blood vessels or by other methods. More Information on Headache Medicines: Headache & Migraine
Also Known As: "Primary Headaches, Secondary Headaches, Cephalalgia"
Pain in the head that occurs due to muscle contractions, blood vessel constrictions or other causes. It may be primary (e.g., migraines, tension headaches, cluster headaches) or secondary (caused by other factors, such as injury or infection). More Information on Headaches: Headache & Migraine
A device that puts pressure on the upper teeth and upper jaw and influences upper jaw growth and upper tooth eruption. It may be removed by the patient and is usually worn 10 to 12 hours per day. More Information on Headgear: Dental Braces & Alignment
FDA-approved claims made by food manufacturers describing an established relationship between a product or product ingredient and a disease or medical condition (e.g., "Diets low in sodium may reduce the risk of high blood pressure"). More Information on Health Claims: Nutrition Basics
"Health Clubs" is more commonly referred to as "Fitness Clubs" in the medical community. Fitness Clubs
Also Known As: "Gyms"
Facilities that provide a workout environment with plenty of equipment and a knowledgeable staff. They often offer classes (e.g., aerobics, yoga) as well as providing equipment for both cardio and strength-training exercises. More Information on Fitness Clubs: Exercise & Weight
These insurance providers offer managed care plans, in which patients pay reduced rates for medical services in exchange for certain limitations on their choice of doctors and/or specialty care. Preventive care is generally emphasized. More Information on Health Maintenance Organization: Healthcare Basics
"Health Question" is more commonly referred to as "Questions for Your Cardiologist" in the medical community. Questions for Your Cardiologist
Also Known As: "Medical Question"
This article suggests questions to print out and bring with you to your next doctor appointment. If you don't feel comfortable asking some of these questions, you can just hand the list to your cardiologist to be sure that they are all addressed. More Information on Questions for Your Cardiologist: Heart Basics
"Health Risk Appraisal" is more commonly referred to as "Coronary Risk Profile" in the medical community. Coronary Risk Profile
Also Known As: "Risk Profile, HRA, Coronary Profile"
A tool for measuring a person's chance of developing coronary artery disease in his or her lifetime. It includes genetic traits, blood pressure, cholesterol, weight, age, activity level and related conditions, such as diabetes. More Information on Coronary Risk Profile: Heart Risk Factors
A document that designates an agent to make healthcare decisions for another person in the event that the person is unable to do so. Healthcare providers must respect the agent's decisions as if he or she were the patient. More Information on Healthcare Proxy: Healthcare Basics
A body weight range that is considered to be healthy for an individual. Those who weigh more than their healthy body weight range are considered overweight. More Information on Healthy Weight: Weight & Obesity Basics
A child's hearing can be evaluated at any age through a variety of procedures. If hearing loss is detected, it can often be treated. A child's ability to hear greatly influences the development of language and communication skills. More Information on Hearing Evaluation: Pediatric Hearing & Vision
The gradual or sudden loss of the sense of sound. May be partial (hearing impairment) or complete (deafness). More Information on Hearing Impairment: Neuro Signs & Symptoms
The gradual or sudden loss of the sense of sound. May be partial (hearing impairment) or complete (deafness). More Information on Hearing Loss: Neuro Signs & Symptoms
Children may experience a gradual or sudden loss of the sense of sound. May be partial (hearing impairment) or complete (deafness), sometimes the result of infections. Problems with hearing are among the most common major abnormalities in babies. More Information on Hearing Loss & Children: Pediatric Hearing & Vision
A child's hearing can be evaluated at any age through a variety of procedures. If hearing loss is detected, it can often be treated. A child's ability to hear greatly influences the development of language and communication skills. More Information on Hearing Tests & Children: Pediatric Hearing & Vision
Physicians and other health care providers represent only the beginning when it comes to managing heart health. There is a vast network of organizations concerned with cardiovascular health information and advocacy in the US and around the world. More Information on Heart & Blood Disorder Organizations: Heart Basics
"Heart Aneurysm" is more commonly referred to as "Ventricular Aneurysm" in the medical community. Ventricular Aneurysm
Also Known As: "Right Ventricular Aneurysm, Septal Aneurysm, Ventricular Septal Aneurysm, Left Ventricular Aneurysm, Interventricular Aneurysm"
Bulging of part of the wall of a ventricle, usually the left. When in the wall between ventricles it is called ventricular septal aneurysm, interventricular aneurysm or septal aneurysm. It may be congenital or from trauma (e.g., heart attack). More Information on Ventricular Aneurysm: Aneurysm
"Heart Arrest" is more commonly referred to as "Cardiac Arrest" in the medical community. Cardiac Arrest
Also Known As: "Cardiopulmonary Arrest, Massive Heart Attack, Sudden Cardiac Arrest, Heart Seizure"
The abrupt, immediate stopping of the heart. Without immediate treatment with a defibrillator, sudden cardiac death is unavoidable. More Information on Cardiac Arrest: Arrhythmia
"Heart Assist Pump" is more commonly referred to as "Ventricular Assist Device" in the medical community. Ventricular Assist Device
Also Known As: "Right Ventricular Assist Device, Heart Pump, Left Ventricular Assist Device, RVAD, VAD, LVAD"
A device that helps either of the heart's lower chambers (ventricles) to pump blood. Some patients require one device to help each ventricle. These devices have been approved by the FDA and are fairly commonly used. More Information on Ventricular Assist Device: Heart Failure
"Heart Atrophy" is more commonly referred to as "Cardiac Atrophy" in the medical community. Cardiac Atrophy
Also Known As: "LVA, Atrophy of the Left Ventricle, Left Ventricular Atrophy"
A decrease in size of the heart. It can be brought on by prolonged immobilization or overall "wasting" that can occur with debilitating, chronic illnesses (e.g., anorexia). Left ventricle atrophy affects the lower left chamber of the heart. More Information on Cardiac Atrophy: Heart Failure
Also Known As: "Acute Myocardial Infarction, MI, Myocardial Infarction, Acute MI, Acute Heart Attack, A Coronary"
Scarring, or death, of heart muscle due to lack of oxygen. Oxygen-rich blood is blocked by a blood clot in a coronary artery, usually due to plaque-related narrowing of the artery. More Information on Heart Attack: Cholesterol
Heart disease and heart attacks are the number one killers of women in America and all other developed countries throughout the world. Every year, coronary artery disease claims more female lives than breast cancer, accidents and diabetes combined. More Information on Heart Attacks & Women: Women's Heart
Also Known As: "Third Degree Heart Block, Atrioventricular Block, First Degree Heart Block, Complete Heart Block, Movitz AV Block, Second Degree Heart Block, AV Block, Complete AV Block"
The delayed or complete lack of electrical communication between the heart's upper chambers and lower chambers. This causes abnormally slow heart rhythms. It may be classified by the extent that electrical activity is disrupted. More Information on Heart Block: Arrhythmia
"Heart Bypass Surgery" is more commonly referred to as "Coronary Artery Bypass Surgery" in the medical community. Coronary Artery Bypass Surgery
Also Known As: "Coronary Bypass Surgery, Coronary Artery Bypass Grafting, CABG, Coronary Artery Bypass"
A surgery to treat coronary artery disease. The surgeon takes a segment of a healthy blood vessel from another part of the body, and uses it to create a detour around the blocked portion of a blood vessel in the heart. More Information on Coronary Artery Bypass Surgery: Bypass Surgery
Although it is accepted that there are racial differences in medical treatment, researchers are struggling to make sense of recent studies examining this area. Experts disagree about the reasons for these differences. More Information on Heart Care & Black Americans: Heart Basics
There are gender differences in the medical treatment of male and female heart patients. Traditionally, diagnoses of heart conditions are based on a male model of symptoms, often resulting in misdiagnosis in women. More Information on Heart Care & Women: Women's Heart
"Heart Catheterization" is more commonly referred to as "Cardiac Catheterization" in the medical community. Cardiac Catheterization
Also Known As: "Outpatient Cardiac Catheterization, Ambulatory Cardiac Catheterization, Catheterization, Cardiac Cath, Arterial Catheterization"
The process by which a catheter is inserted by a physician into a blood vessel and all the way to the heart, in order to obtain information about the heart and the coronary arteries. This term may also describe catheter-based procedures. More Information on Cardiac Catheterization: Catheter Tests & Procedures
An experimental sac-like device that fits around the outside of an enlarged heart and applies inward pressure. It may help the heart to shrink to normal size or prevent further enlargement. A variation is a metal band (clasp) around the heart. More Information on Heart Clasp: Heart Failure
People with diabetes are at an increased risk of heart and blood vessel diseases, including heart attack, heart failure, stroke, coronary artery disease, high blood pressure and more. More Information on Heart Conditions & Diabetes: Diabetes Heart & Blood Vessel
A balanced diet rich in fruits, vegetables and whole grains and low in saturated fat, trans fat and salt, to promote wellness and reduce the risk of chronic diseases such as high blood pressure, atherosclerosis or obesity. More Information on Heart Diet: Heart Diet & Fitness
"Heart Disease and Women" is more commonly referred to as "Cardiovascular Disease & Women" in the medical community. Cardiovascular Disease & Women
Also Known As: "Women and Heart Disease Myths, Women and Heart Disease"
It is estimated that one out of every two women will eventually die from conditions that are the result of cardiovascular disease (diseases of the heart and/or blood vessels). More Information on Cardiovascular Disease & Women: Women's Heart
Also Known As: "Women and Heart Disease Risk Factors, Risk Factors and Women"
Women have some of the same risks for heart disease as men, such as smoking, obesity and high cholesterol levels. A woman's risk for heart disease increases after menopause. More Information on Heart Disease Risk Factors & Women: Women's Heart
"Heart Enlargement" is more commonly referred to as "Enlarged Heart" in the medical community. Enlarged Heart
Also Known As: "Cardiomegaly, Osteochondrodysplasia Syndrome, Athlete Heart"
A sign that the heart is overworked. When underlying disease or other conditions (e.g., heavy exercise) cause the heart to work harder, the heart enlarges to compensate for the increased need. More Information on Enlarged Heart: Heart Signs & Symptoms
Also Known As: "Systolic Heart Failure, Diminished Heart Capacity, Congestive Heart Failure, Diastolic Heart Failure, Left-Ventricular Heart Failure, CHF, LV Heart Failure, Left Sided Heart Failure"
A chronic condition in which at least one chamber of the heart is not pumping well enough to meet the body's needs. This leads to congestion in the lungs or pulmonary blood vessels and may cause fluid backup or swelling in the lungs, legs and ankles. More Information on Heart Failure: Heart Failure
"Heart Failure Class" is more commonly referred to as "New York Heart Association Class" in the medical community. New York Heart Association Class
Also Known As: "NYHA Class"
A classification of heart failure stages. I -- no symptoms or activity limits. II -- mild symptoms; minor activity limits. III -- symptoms occur during exertion; significant activity limits. IV -- symptoms occur at rest; unable to engage in activity. More Information on New York Heart Association Class: Heart Failure
A balanced diet rich in fruits, vegetables and whole grains and low in saturated fat, trans fat and salt, to promote wellness and reduce the risk of chronic diseases such as high blood pressure, atherosclerosis or obesity. More Information on Heart Healthy Diet: Heart Diet & Fitness
"Heart Inflammation" is more commonly referred to as "Pancarditis" in the medical community. Pancarditis
Also Known As: "Cardiac Inflammation"
General inflammation of the heart including all three of its layers: The myocardium, pericardium and endocardium. More Information on Pancarditis: Heart Injuries & Infections
An experimental sac-like device that fits around the outside of an enlarged heart and applies inward pressure. It may help the heart to shrink to normal size or prevent further enlargement. A variation is a metal band (clasp) around the heart. More Information on Heart Jacket: Heart Failure
Also Known As: "Lung Heart Machine, Extracorporeal Circulation Machine, Oxygenator Bypass Machine, Pump Oxygenator"
A machine that takes over the heart's functions when the heart is stopped during open-heart surgery. A heart-lung machine enables cardiopulmonary bypass, or the procedure of circulating blood and oxygen for a patient during open-heart surgery. More Information on Heart Lung Bypass Machine: Bypass Surgery
Also Known As: "Lung Heart Machine, Extracorporeal Circulation Machine, Oxygenator Bypass Machine, Heart Lung Bypass Machine, Pump Oxygenator"
A machine that takes over the heart's functions when the heart is stopped during open-heart surgery. A heart-lung machine enables cardiopulmonary bypass, or the procedure of circulating blood and oxygen for a patient during open-heart surgery. More Information on Heart Lung Machine: Bypass Surgery
Also Known As: "Continuous Murmur, Cardiac Murmur, Systolic Murmur, Murmur, Diastolic Murmur"
An abnormal heart sound. It may stem from a heart valve problem or be "innocent" (unassociated with disease). It may increase the risk of infection from dental procedures, leading to the prophylactic use of antibiotics. More Information on Heart Murmur: Heart Signs & Symptoms
"Heart Output" is more commonly referred to as "Cardiac Output" in the medical community. Cardiac Output
Also Known As: "Decreased Cardiac Output, Low Cardiac Output"
The measurement of blood pumped from the left or right ventricle per minute. Decreased output is a sign that the heart is not performing efficiently. More Information on Cardiac Output: Heart Failure
"Heart Palpitation" is more commonly referred to as "Palpitations" in the medical community. Palpitations
Also Known As: "Racing Heart"
An awareness of a strong, fast, irregular or "galloping" heartbeat. Palpitations tend to be unpleasant and may even be quite violent. Fortunately, palpitations are usually brief. More Information on Palpitations: Heart Signs & Symptoms
"Heart Patients & Pregnancy" is more commonly referred to as "Pregnancy & the Heart" in the medical community. Pregnancy & the Heart
Also Known As: "Pregnancy and Cardiovascular Disease, Cardiovascular Disease and Pregnancy"
The best way for a woman to increase her chances of bringing a healthy baby into the world (and to remain healthy herself) is to involve a physician and other professional medical personnel as soon as she decides to have a child. More Information on Pregnancy & the Heart: Women's Heart
"Heart Problem" is more commonly referred to as "Cardiovascular Disease" in the medical community. Cardiovascular Disease
A term that refers to diseases of the heart and/or blood vessels. These conditions develop over time and can interrupt the flow of blood to the heart and brain, leading to heart attack, stroke or other problems. More Information on Cardiovascular Disease: Heart Basics
"Heart Pump" is more commonly referred to as "Ventricular Assist Device" in the medical community. Ventricular Assist Device
Also Known As: "Right Ventricular Assist Device, Left Ventricular Assist Device, RVAD, VAD, LVAD, Heart Assist Pump"
A device that helps either of the heart's lower chambers (ventricles) to pump blood. Some patients require one device to help each ventricle. These devices have been approved by the FDA and are fairly commonly used. More Information on Ventricular Assist Device: Heart Failure
The pace of the heart. A normal resting heart rate is 60 to 85 beats per minute. A normal exercising heart rate is 50 to 75 percent of the patient's maximum heart rate, which is a suggested figure based on age. More Information on Heart Rate: Heart Basics
"Heart Related Gestational Problems" is more commonly referred to as "Gestational Heart Related Problems" in the medical community. Gestational Heart Related Problems
Heart-related problems that can happen during the pregnancies of otherwise healthy women. These include high blood pressure, diabetes, and other problems, some of which can be life-threatening in rare cases. More Information on Gestational Heart Related Problems: Women's Heart
"Heart Revascularization" is more commonly referred to as "Revascularization" in the medical community. Revascularization
Also Known As: "Cardiac Revascularization, Myocardial Revascularization"
he process or practice of restoring blood flow to a body part. In the case of the heart, this is done by surgery such as bypass surgery, or by dissolving blood clots with medications called "clot busters." More Information on Revascularization: Vascular Disease
Ripping or tearing of the walls of the heart, heart muscle, cardiac septum, chordae tendineae or any of the heart's valves. It may be caused by many conditions, including heart attacks (heart muscle/septum ruptures) or ruptured chordae tendineae. More Information on Heart Rupture: Heart Injuries & Infections
"Heart Scan" is more commonly referred to as "Ultrafast Computed Tomography" in the medical community. Ultrafast Computed Tomography
Also Known As: "Calcium CT, Ultrafast CT, Electron Beam Computed Tomography, EBCT, Ultrafast Heart Scan"
A test that takes multiple clear pictures of the beating heart and the coronary arteries. It also locates and measures the calcium deposits in the coronary arteries, which may provide an indication of how much hard (calcified) plaque is present. More Information on Ultrafast Computed Tomography: Heart Imaging & Rhythm Tests
"Heart Seizure" is more commonly referred to as "Cardiac Arrest" in the medical community. Cardiac Arrest
Also Known As: "Cardiopulmonary Arrest, Massive Heart Attack, Sudden Cardiac Arrest, Heart Arrest"
The abrupt, immediate stopping of the heart. Without immediate treatment with a defibrillator, sudden cardiac death is unavoidable. More Information on Cardiac Arrest: Arrhythmia
"Heart Stunning" is more commonly referred to as "Cardiac Stunning" in the medical community. Cardiac Stunning
Also Known As: "Myocardial Stunning"
Temporary heart failure due to an event such as open-heart surgery or use of a heart-lung machine. The stunned heart cannot pump enough blood to meet the body's needs. It normally passes in a few days, but it can be fatal. More Information on Cardiac Stunning: Heart Failure
Any disease or condition that has a secondary effect on the heart. While not technically "heart diseases," these conditions can cause problems with the functions of the heart or lead to serious heart disorders. More Information on Heart Threatening Illnesses: Heart Injuries & Infections
Also Known As: "Cardiac Transplantation, Artificial Heart Transplantation"
A procedure by which a permanently diseased heart is removed and replaced with either an organic or artificial heart. The majority of heart transplants are performed in patients suffering from cardiomyopathy or coronary artery disease. More Information on Heart Transplant Surgery: Heart Failure
"Heart Trauma" is more commonly referred to as "Trauma to Heart or Blood Vessels" in the medical community. Trauma to Heart or Blood Vessels
Also Known As: "Cardiac Trauma"
A physical injury or wound to the heart or blood vessels caused by an external force or violence. The major causes of trauma are motor vehicle accidents, falls, burns and gunshot wounds. More Information on Trauma to Heart or Blood Vessels: Heart Injuries & Infections
There are four heart valves (aortic, tricuspid, pulmonic and mitral). They keep blood flowing in only one direction. When the heart contracts (beats) they swing open to allow blood through and then shut tightly to keep blood from leaking backward. More Information on Heart Valve: Heart Valve
"Heart Valve Atresia" is more commonly referred to as "Valvular Atresia" in the medical community. Valvular Atresia
A birth defect of the heart in which one or more of the heart's valves is completely closed, causing an inadequate flow of blood between the heart's chambers. It can occur in any of the heart's four valves (aortic, pulmonic, mitral or tricuspid). More Information on Valvular Atresia: Heart Valve
"Heart Valve Disease" is more commonly referred to as "Valvular Heart Disease Basics" in the medical community. Valvular Heart Disease Basics
Also Known As: "Rheumatic Valve Disease, Valve Disease"
Any fault or abnormality of one or more of the heart's valves: the pulmonic, mitral, aortic or tricuspid. Valvular heart disease is characterized by stenosis (narrowing) and regurgitation (blood flow in the wrong direction between heart chambers). More Information on Valvular Heart Disease Basics: Heart Valve
"Heart Valve Function" is more commonly referred to as "Valvular Function" in the medical community. Valvular Function
Within the heart are four valves made up of either two or three flaps (cusps) that swing open and close tightly like gates. The valves open and shut with the beating of the heart and control blood flow through the heart's chambers. More Information on Valvular Function: Heart Valve
Also Known As: "Valvoplasty, Annuloplasty, Balloon Valvuloplasty, Commissurotomy, Valvotomy, Percutaneous Balloon Valvuloplasty, Balloon Commissurotomy, Valvulotomy"
Various procedures to repair or replace heart valves that are damaged as the result of valvular heart disease. More Information on Heart Valve Procedures: Heart Valve
"Heart-Lung Resuscitation" is more commonly referred to as "CPR" in the medical community. CPR
Also Known As: "Mouth-to-Mouth Resuscitation, Cardiac Compression, Cardiopulmonary Resuscitation, Artificial Respiration"
An emergency technique that helps someone whose heart and/or breathing has stopped. CPR cannot restart the heart but can make sure that blood and oxygen continue to circulate through the body, keeping the patient alive until help can arrive. More Information on CPR: First Aid & Safety
The contractions that occur as a result of the electrical impulses through the heart's chambers produce the sound and action commonly known as heartbeat. More Information on Heartbeat: Heart Basics
A burning sensation in the upper abdomen or chest area that is caused by acid reflux of stomach contents. Contrary to its name, it is associated with digestion rather than the heart. More Information on Heartburn: GERD & Heartburn
Also Known As: "Heat Illness, Heat Disorder, Heat Disease"
Illnesses caused when the body is unable to cool itself by sweating. They can be serious (heat exhaustion and heat stroke) or less serious (heat rash or heat cramps). Patients with heart conditions are at higher risk as are the elderly and children. More Information on Heat Condition: First Aid & Safety
Muscle cramps caused by a depletion of salt in the body. Along with moisture, the body loses salt in sweat. Cramps occur in people who are engaging in strenuous activity, who are unused to the heat, who sweat a lot or who do not drink enough fluids. More Information on Heat Cramps: First Aid & Safety
Also Known As: "Heat Condition, Heat Illness, Heat Disorder"
Illnesses caused when the body is unable to cool itself by sweating. They can be serious (heat exhaustion and heat stroke) or less serious (heat rash or heat cramps). Patients with heart conditions are at higher risk as are the elderly and children. More Information on Heat Disease: First Aid & Safety
Also Known As: "Heat Disease, Heat Condition, Heat Illness"
Illnesses caused when the body is unable to cool itself by sweating. They can be serious (heat exhaustion and heat stroke) or less serious (heat rash or heat cramps). Patients with heart conditions are at higher risk as are the elderly and children. More Information on Heat Disorder: First Aid & Safety
A heat-related illness that develops after days of repeated exposure to high temperatures coupled with not drinking enough fluids to replace what the body has lost through sweat. Less serious than heat stroke, it can lead to heat stroke if untreated. More Information on Heat Exhaustion: First Aid & Safety
Also Known As: "Heat Disorder, Heat Disease, Heat Condition"
Illnesses caused when the body is unable to cool itself by sweating. They can be serious (heat exhaustion and heat stroke) or less serious (heat rash or heat cramps). Patients with heart conditions are at higher risk as are the elderly and children. More Information on Heat Illness: First Aid & Safety
A skin irritation caused by profuse sweating in a hot or humid climate. It is most common in young children, but can occur at any age. It is most commonly found on areas where sweat is likely to pool or remain on the skin (neck, groin, chest, etc.). More Information on Heat Rash: Skin Signs & Symptoms
Also Known As: "Heat Disease, Heat Condition, Heat Illness, Heat Disorder"
Illnesses caused when the body is unable to cool itself by sweating. They can be serious (heat exhaustion and heat stroke) or less serious (heat rash or heat cramps). Patients with heart conditions are at higher risk as are the elderly and children. More Information on Heat Related Illness: First Aid & Safety
A condition in which body temperature rises and the body's sweating function fails. The body cannot cool itself and temperatures may rise as high as 106 degrees F in 10 to 15 minutes. It can be fatal or result in permanent disability. More Information on Heat Stroke: First Aid & Safety
"Heat Therapy" is more commonly referred to as "Hyperthermia Therapy" in the medical community. Hyperthermia Therapy
Also Known As: "Local Hyperthermia, Microwave Therapy, Whole Body Hyperthermia, Regional Hyperthermia, Microwave Thermotherapy"
A type of treatment in which body tissue is exposed to high temperatures (up to 113 degrees Fahrenheit) to damage and kill cancer cells or to make them vulnerable to other forms of treatment (e.g., radiation, certain anticancer drugs). More Information on Hyperthermia Therapy: Chemo & Radiation Therapy
"Heat Therapy" is more commonly referred to as "Thermotherapy" in the medical community. Thermotherapy
The use of heat to treat a disease or disorder. Techniques include heating pads, hot compresses and probes inserted into a specific area to deliver heat to one location. More Information on Thermotherapy: Pain Management
"Hebephrenia" is more commonly referred to as "Disorganized Schizophrenia" in the medical community. Disorganized Schizophrenia
Also Known As: "Disorganized Type Schizophrenia"
Schizophrenia with severe disintegration of personality, including erratic behavior and speech, often becoming evident in puberty. More Information on Disorganized Schizophrenia: Schizophrenia & Psychosis
"Heel Spur" is more commonly referred to as "Plantar Fasciitis" in the medical community. Plantar Fasciitis
A painful condition in the sole portion of the foot (plantar) caused by excessive wear, inflammation or tearing of the fibrous connective tissue (fascia). Pain is usually felt on the underside of the heel. More Information on Plantar Fasciitis: Arm & Leg Pain
An emergency technique used when a person's airway becomes blocked by a piece of food or other object. It can be used safely on both adults and children, but should not be used on infants. More Information on Heimlich: First Aid & Safety
An emergency technique used when a person's airway becomes blocked by a piece of food or other object. It can be used safely on both adults and children, but should not be used on infants. More Information on Heimlich Maneuver: First Aid & Safety
Bacteria often found in the stomach. While they frequently cause no problems, they may damage stomach and duodenal tissue, causing ulcers. More Information on Helicobacter Pylori: Gastritis & Ulcer
"Heller's Syndrome" is more commonly referred to as "Childhood Disintegrative Disorder" in the medical community. Childhood Disintegrative Disorder
A type of pervasive developmental disorder in which children develop normally for their first two years and then lose previously learned social, language and/or motor skills. More Information on Childhood Disintegrative Disorder: Autism & Related Disorders
An illness that results from untreated preeclampsia, a condition that affects some women with diabetes during the final stages of pregnancy. HELLP syndrome can result in liver failure and death. More Information on HELLP Syndrome: Pregnancy Management
"Helping Heart Patients" is more commonly referred to as "When a Loved One Has Heart Disease" in the medical community. When a Loved One Has Heart Disease
Also Known As: "Supporting Heart Patients"
This article is written for the loved ones of heart patients who are dealing with the short-term stress of a test, procedure or recent diagnosis of a loved one with heart disease. It includes research and practical coping strategies. More Information on When a Loved One Has Heart Disease: Heart Basics
One of two proteins found on the surface of the virus that causes influenza. It helps attach the virus to the host cell. More Information on Hemagglutinin: Infectious Disease Basics
Dense collections of dilated small blood vessels (capillaries) that create strawberry-colored marks that vary from tiny blisters to large and multiple tumor-like growths. They usually start in infancy and grow before slowly shrinking. More Information on Hemangiomas: Skin Discoloration
A rare tumor involving the blood vessel and soft tissues within bones. It can occur anywhere, but is most in the bones of the pelvis, thigh or upper arm. It can be benign (noncancerous) or malignant. More Information on Hemangiopericytoma: Leukemia & Bone Cancer
"Hemangiosarcoma" is more commonly referred to as "Angiosarcoma" in the medical community. Angiosarcoma
Also Known As: "Lymphangiosarcoma"
A rare form of cancer that begins within blood vessels (hemangiosarcoma) or lymph vessels (lymphangiosarcoma). More Information on Angiosarcoma: Leukemia & Bone Cancer
Vomiting blood, generally associated with bleeding in the esophagus, stomach or upper small intestine. The blood may be bright red or darker, with an old, clotted appearance. More Information on Hematemesis: Diabetes Signs & Symptoms
Passing bloody stool, generally associated with bleeding in the colon. The stool may appear red, maroon or black. More Information on Hematochezia: Diabetes Signs & Symptoms
A blood test. Meaning ?to separate blood,? hematocrit (Hct) measures the amount of space taken up in the blood by red blood cells. As a result, it is an indicator of both the number and the size of the red blood cells. More Information on Hematocrit: Blood Tests
"Hematocrit Calculation" is more commonly referred to as "CBC" in the medical community. CBC
Also Known As: "Red Blood Cell Count, Blood Count, Complete Blood Count, Platelet Count, White Blood Cell Count, Hemoglobin Count, Differential Blood Count"
A routine blood test that measures the composition of blood cells within the blood. This usually includes counts of all blood cells (red, white and platelets), each type of cell, levels of hemoglobin and calculations based on those measurements. More Information on CBC: Blood Tests
Physician specializing in the diagnosis and treatment of disorders of blood and blood-forming tissues. More Information on Hematologist: Leukemia & Bone Cancer
"Hematomas" is more commonly referred to as "Bruises" in the medical community. Bruises
Also Known As: "Contusions"
Areas of discolored skin that occur when small blood vessels under the skin break and leak blood into the soft tissues underneath the skin. They are commonly caused by falls, car accidents, sports injuries and blows from objects or other people. More Information on Bruises: First Aid & Safety
Stem cells that can form into blood cells. Found in bone marrow, the bloodstream and the umbilical cord. More Information on Hematopoietic Stem Cell: Leukemia & Bone Cancer
A type of chorea (involuntary repetitive, jerky movements) characterized by violent, flinging movements on one side of the body. It is most commonly caused by stroke. More Information on Hemiballismus: Neuro Signs & Symptoms
Groups of polysaccharides (carbohydrate chains made up of 10 or more sugar molecules) in dietary fibers that are fermented easier than cellulose (chain made up of hundreds of glucose molecules). More Information on Hemicelluloses: Carbs & Sugars
"Hemicolectomy" is more commonly referred to as "Colectomy" in the medical community. Colectomy
Also Known As: "Left Hemicolectomy, Bowel Resection, Open Colectomy, Right Hemicolectomy, Partial Colectomy, Laparoscopic Colectomy, Sigmoid Colectomy"
Surgical removal of all or part of the colon (large intestine). Partial colectomy may also be called hemicolectomy. It may be performed in a open procedure (one large incision) or through laparoscopy (uses a camera and several smaller incisions). More Information on Colectomy: Digestive Treatments
A rare form of chronic headache marked by continuous pain on one side of the face. Symptoms are autonomic (e.g., runny nose, tearing, sweating) or migraine-like (e.g., nausea, vomiting, sensitivity to light) and vary in severity. More Information on Hemicrania Continua: Headache & Migraine
A type of dystonia (sustained muscle contractions leading to twisting movements and abnormal posture) that affects the arm and leg on the same side of the body. More Information on Hemidystonia: Movement Disorders
A neuromuscular disorder marked by frequent involuntary contractions of face muscles. Intermittent twitching of the eyelid muscle gradually spreads to involve all of the muscles on one side of the face almost continuously. More Information on Hemifacial Spasm: Movement Disorders
A rare form of migraine that may be preceded by temporary motor paralysis on one side of the body, numbness or a pins-and-needles sensation. These symptoms usually resolve once the headache appears. More Information on Hemiplegic Migraine: Headache & Migraine
A procedure in which a tooth with two roots is cut in half, leaving two separate roots. It is performed when the area between the roots decays or the bone is loss due to periodontal disease. More Information on Hemisection: Dental Restorations
Also Known As: "Iron Overload Disease, Bronze Diabetes"
A genetic condition that causes the body to absorb too much iron, leading to liver disease, diabetes and eventually heart failure. More Information on Hemochromatosis: Digestive Health Basics
"Hemocytoblast" is more commonly referred to as "Stem Cells" in the medical community. Stem Cells
Immature body cells that can grow to become any one of a variety of different body cells. They are found in bone marrow, lymphatic tissue and in embryos. Research is ongoing concerning their potential use in cancer treatment. More Information on Stem Cells: Leukemia & Bone Cancer
A type of dialysis in which waste products are removed from the blood when the kidneys are no longer able to perform this task. Blood is drawn from the body in a tube, passed through a filter to remove waste products and then returned to the body. More Information on Hemodialysis: Kidney (Renal)
A protein component of red blood cells that transports oxygen to -- and carbon dioxide from -- the body. Hemoglobin gives blood its red color. More Information on Hemoglobin: Heart Basics
"Hemoglobin A1C Test" is more commonly referred to as "Glycohemoglobin Test" in the medical community. Glycohemoglobin Test
Also Known As: "Fasting Hemoglobin, HbA1C Test, GHb Test, Diabetic Control Index, Glycosylated Hemoglobin Test, Total Fasting Hemoglobin Test, Hb A1c"
A blood test that is used to monitor diabetes, a risk factor for heart disease. It measures the levels of hemoglobin in the blood that have been glycosylated, or connected to glucose. More Information on Glycohemoglobin Test: Diabetes & Endocrine Tests
"Hemoglobin Count" is more commonly referred to as "CBC" in the medical community. CBC
Also Known As: "Red Blood Cell Count, Blood Count, Complete Blood Count, Platelet Count, White Blood Cell Count, Differential Blood Count, Hematocrit Calculation"
A routine blood test that measures the composition of blood cells within the blood. This usually includes counts of all blood cells (red, white and platelets), each type of cell, levels of hemoglobin and calculations based on those measurements. More Information on CBC: Blood Tests
A blood disease in newborns, marked by anemia, edema, jaundice and enlargement of the liver and spleen. Caused by an antibody from the mother, usually due to blood incompatibility. More Information on Hemolytic Disease of the Newborn: Pregnancy Management
A disorder that may cause kidney failure and anemia. It frequently occurs after an E. coli infection. It is common among children and is the leading cause of sudden kidney failure in children. More Information on Hemolytic Uremic Syndrome: Gastrointestinal System Cancer
A genetic disorder of the blood that causes excessive bleeding due to an inability of the blood to properly clot. More Information on Hemophilia: Anemia & Blood Disorders
"Hemophilia A" is more commonly referred to as "Classic Hemophilia" in the medical community. Classic Hemophilia
Also Known As: "Factor VIII Deficiency"
A type of hemophilia in which clotting factor VIII is low or missing in a patient. About 90 percent of people with hemophilia have this type. More Information on Classic Hemophilia: Anemia & Blood Disorders
"Hemophilia B" is more commonly referred to as "Christmas Disease" in the medical community. Christmas Disease
Also Known As: "Factor IX Deficiency"
A type of hemophilia in which clotting factor IX is low or missing in a patient. About 10 percent of people with hemophilia have this type. It is named after Stephen Christmas, the first patient with hemophilia B studied in detail. More Information on Christmas Disease: Anemia & Blood Disorders
A genetic disorder of the blood that causes excessive bleeding due to an inability of the blood to properly clot. More Information on Hemophilia Disease: Anemia & Blood Disorders
An infection that affects the whites of the eyes. It typically starts out as eye pain that is suddenly followed by red and watery eyes. Other symptoms include swelling, light sensitivity and blurry vision. More Information on Hemorrhagic Conjunctivitis: Eye Conditions
A group of illnesses caused by several families of viruses. Typically, they damage the vascular system and the body's ability to regulate itself. Some types involve mild illness, but many involve life-threatening disease. More Information on Hemorrhagic Fever: Tropical Disease
A form of hemorrhagic fever that occurs in Europe and Asia. It is made up of a group of clinically similar illnesses caused by hantaviruses from the family Bunyaviridae. More Information on Hemorrhagic Fever with Renal Syndrome: Infectious Disease Basics
"Hemorrhagic Stroke" is more commonly referred to as "Stroke & the Brain" in the medical community. Stroke & the Brain
Also Known As: "Embolic Stroke, Ischemic Stroke, CVA, Cerebrovascular Accident, Brain Attack, Thrombotic Stroke"
A potentially fatal event in which oxygen-rich blood flow to the brain is restricted. There are two main types: ischemic (caused by obstructing blood clot) and hemorrhagic (caused by bleeding in the brain). Ischemic is most common. More Information on Stroke & the Brain: Stroke
Stretched, swollen veins in and around the anus and lower rectum that may cause itching, pain and sometimes bleeding. More Information on Hemorrhoids: Anal & Rectal Disorders
Also Known As: "Vascular Sealing Device, Collagen Plug, Femoral Access Closure Device, Puncture Closure Device, Vascular Hemostasis Device"
A device that may be used to more quickly stop the femoral artery from bleeding after a catheter-based test or procedure. More Information on Hemostatic Device: Catheter Tests & Procedures
"Hemp" is more commonly referred to as "Marijuana Abuse" in the medical community. Marijuana Abuse
Also Known As: "Marijuana"
Use of marijuana produces intoxicating effects such as mild euphoria when smoked or eaten. Side effects include impaired perception and motor skills, decreased short-term memory, paranoia, mood swings and hallucinations. More Information on Marijuana Abuse: Alcohol & Substance Abuse
Two viruses that are related but not identical. Both are thought to be found in bats and passed to humans through other animals. Both can be fatal. More Information on Hendra & Nipah Virus: Infectious Disease Basics
Also Known As: "Hendra Virus Disease, Hendra Virus Infection"
Infection with a member of the virus family Paramyxoviridae. It was first isolated in 1994 in Hendra, a suburb of Brisbane, Australia. Thought to be found in bats, it is transmitted to humans through horses and can be fatal. More Information on Hendra Virus: Infectious Disease Basics
Infection with a member of the virus family Paramyxoviridae. It was first isolated in 1994 in Hendra, a suburb of Brisbane, Australia. Thought to be found in bats, it is transmitted to humans through horses and can be fatal. More Information on Hendra Virus Disease: Infectious Disease Basics
Infection with a member of the virus family Paramyxoviridae. It was first isolated in 1994 in Hendra, a suburb of Brisbane, Australia. Thought to be found in bats, it is transmitted to humans through horses and can be fatal. More Information on Hendra Virus Infection: Infectious Disease Basics
A paste, made from leaves and twigs of a henna shrub, which are applied to the surface of finger nails, hair or skin to stain them a reddish-brown color. Some people have reported experiencing contact dermatitis. More Information on Henna: Cosmetic, Chemical & Metal
Adverse reaction to henna (a paste, made from leaves and twigs of a henna shrub), which is used to stain finger nails, hair or skin to a reddish-brown color. Some people have reported experiencing contact dermatitis. More Information on Henna Allergy: Cosmetic, Chemical & Metal
Adverse reaction to henna (a paste, made from leaves and twigs of a henna shrub), which is used to stain finger nails, hair or skin to a reddish-brown color. Some people have reported experiencing contact dermatitis. More Information on Henna Stain Allergy: Cosmetic, Chemical & Metal
A liver infection caused by an RNA virus and transmitted by ingestion of infected food and water. It has a shorter incubation and generally milder symptoms than hepatitis B. More Information on Hep A: Liver, Pancreas & Biliary
A liver infection caused by a DNA virus and transmitted by contaminated blood products, sexual contact or use of contaminated needles and instruments. It has a long incubation and may cause serious damage to the liver. More Information on Hep B: Liver, Pancreas & Biliary
Also Known As: "HCV, Chronic Hepatitis C, Hepatitis C Virus"
A liver infection caused by an RNA virus and transmitted primarily by blood and blood products or sexual contact. Most cases of non-A, non-B hepatitis are of this type, and it is clinically indistinguishable from hepatitis B. More Information on Hep C: Liver, Pancreas & Biliary
A liver infection caused by an RNA virus, occurring either simultaneously with hepatitis B or as a superinfection in hepatitis B carriers. It is typically more severe than other forms of hepatitis and is transmitted through sex or blood products. More Information on Hep D: Liver, Pancreas & Biliary
Self-limited, acute infection of the liver caused by an RNA virus. Symptoms are similar to those of hepatitis A and spread via contaminated drinking water and food. It is endemic to developing countries. More Information on Hep E: Liver, Pancreas & Biliary
A distant relative of the hepatitis C virus that may be transmitted through transfusions. Its role in acute and chronic hepatitis remains unclear, and it may not even replicate in the liver. More Information on Hep G: Liver, Pancreas & Biliary
Also Known As: "High Efficiency Particulate Arrestance, True HEPA, High Efficiency Particulate Air Filter"
Highly effective type of filter that removes particles from the air by forcing them through screens with microscopic pores. HEPA is an acronym for high efficiency particulate air filter. More Information on HEPA Air Filter: Allergy Basics
Also Known As: "High Efficiency Particulate Arrestance, True HEPA, HEPA Air Filter, High Efficiency Particulate Air Filter"
Highly effective type of filter that removes particles from the air by forcing them through screens with microscopic pores. HEPA is an acronym for high efficiency particulate air filter. More Information on HEPA Filters: Allergy Basics
Also Known As: "Liquaemin, Heparin Leo, Unfractionated Heparin, Calciparine"
A brand of anticoagulants, medications that decrease the ability of the blood to clot. While clotting is a necessary and life-sustaining function, anticoagulants reduce the risk of a clot forming and blocking blood flow through a major blood vessel. More Information on Heparin: Heart Drug & Medication
Also Known As: "Liquaemin, Unfractionated Heparin, Calciparine"
A brand of anticoagulants, medications that decrease the ability of the blood to clot. While clotting is a necessary and life-sustaining function, anticoagulants reduce the risk of a clot forming and blocking blood flow through a major blood vessel. More Information on Heparin Leo: Heart Drug & Medication
Referring to or affecting the liver, an organ in the abdomen that aids in digestion and regulates levels of vital substances in blood. More Information on Hepatic: Liver, Pancreas & Biliary
Changes in brain function caused by advanced liver disease. It may progress to loss of consciousness and coma. More Information on Hepatic Coma: Liver, Pancreas & Biliary
Changes in brain function caused by advanced liver disease. It may progress to loss of consciousness and coma. More Information on Hepatic Encephalopathy: Liver, Pancreas & Biliary
Inflammation of the liver. This can occur due to many causes, including a group of conditions called viral hepatitis (hepatitis A, B, C, D or E) which can be transmitted from person to person. However, not all cases of hepatitis are viral. More Information on Hepatitis: Liver, Pancreas & Biliary
Inflammation of the liver caused by a viral infection. There are five known forms (hepatitis A, B, C, D or E). Hepatitis A is contracted from contaminated food or water while type B is most often transmitted sexually. More Information on Hepatitis (Sexually Transmitted): STD & Genital Infections
Inflammation of the liver caused by a viral infection. There are five forms (hepatitis A, B, C, D or E). Hepatitis B is the most commonly associated with sexual transmission, but all viral forms pose risks, especially for pregnant women. More Information on Hepatitis (Sexually Transmitted) & Women: STD & Genital Infections
Inflammation of the liver caused by a viral infection. There are five known forms (hepatitis A, B, C, D or E). Hepatitis A is contracted from contaminated food or water while type B is the most commonly sexually transmitted. More Information on Hepatitis (Viral): Liver, Pancreas & Biliary
A liver infection caused by an RNA virus and transmitted by ingestion of infected food and water. It has a shorter incubation and generally milder symptoms than hepatitis B. More Information on Hepatitis A: Liver, Pancreas & Biliary
Also Known As: "Hepatitis Shot, Hepatitis B Vaccine"
A shot to prevent some forms of viral hepatitis by signaling the production of antibodies against the virus. More Information on Hepatitis A Vaccine: Liver, Pancreas & Biliary
A liver infection caused by a DNA virus and transmitted by contaminated blood products, sexual contact or use of contaminated needles and instruments. It has a long incubation and may cause serious damage to the liver. More Information on Hepatitis B: Liver, Pancreas & Biliary
Also Known As: "Hepatitis A Vaccine, Hepatitis Shot"
A shot to prevent some forms of viral hepatitis by signaling the production of antibodies against the virus. More Information on Hepatitis B Vaccine: Liver, Pancreas & Biliary
Also Known As: "HCV, Chronic Hepatitis C, Hepatitis C Virus, Hep C"
A liver infection caused by an RNA virus and transmitted primarily by blood and blood products or sexual contact. Most cases of non-A, non-B hepatitis are of this type, and it is clinically indistinguishable from hepatitis B. More Information on Hepatitis C: Liver, Pancreas & Biliary
A liver infection caused by an RNA virus and transmitted primarily by blood and blood products or sexual contact. Most cases of non-A, non-B hepatitis are of this type, and it is clinically indistinguishable from hepatitis B. More Information on Hepatitis C Virus: Liver, Pancreas & Biliary
A liver infection caused by an RNA virus, occurring either simultaneously with hepatitis B or as a superinfection in hepatitis B carriers. It is typically more severe than other forms of hepatitis and is transmitted through sex or blood products. More Information on Hepatitis D: Liver, Pancreas & Biliary
A liver infection caused by an RNA virus, occurring either simultaneously with hepatitis B or as a superinfection in hepatitis B carriers. It is typically more severe than other forms of hepatitis and is transmitted through sex or blood products. More Information on Hepatitis Delta: Liver, Pancreas & Biliary
Self-limited, acute infection of the liver caused by an RNA virus. Symptoms are similar to those of hepatitis A and spread via contaminated drinking water and food. It is endemic to developing countries. More Information on Hepatitis E: Liver, Pancreas & Biliary
A distant relative of the hepatitis C virus that may be transmitted through transfusions. Its role in acute and chronic hepatitis remains unclear, and it may not even replicate in the liver. More Information on Hepatitis G: Liver, Pancreas & Biliary
Also Known As: "Hepatitis B Vaccine, Hepatitis A Vaccine"
A shot to prevent some forms of viral hepatitis by signaling the production of antibodies against the virus. More Information on Hepatitis Shot: Liver, Pancreas & Biliary
Also Known As: "Hepatitis Shot, Hepatitis B Vaccine, Hepatitis A Vaccine"
A shot to prevent some forms of viral hepatitis by signaling the production of antibodies against the virus. More Information on Hepatitis Vaccinations: Liver, Pancreas & Biliary
"Hepatoblastoma" is more commonly referred to as "Liver Cancer in Children" in the medical community. Liver Cancer in Children
Also Known As: "Pediatric Liver Cancer, Pediatric Hepatocellular Carcinoma, Juvenile Liver Cancer, Primary Liver Cancer in Children, Juvenile Hepatocellular Carcinoma, Hepatocellular Cancer in Children"
Two types of cancer that form in the tissues of the liver. Hepatoblastoma usually occurs in children under three years old. Hepatocellular carcinoma can occur at any age. More Information on Liver Cancer in Children: Pediatric Cancer
"Hepatocellular Cancer" is more commonly referred to as "Liver Cancers" in the medical community. Liver Cancers
Also Known As: "Hepatoma, Primary Liver Cancers, Hepatocellular Carcinoma"
Cancer of the liver, an organ in the abdomen that aids in digestion and regulates levels of vital substances in blood. While the most common cancer to occur worldwide, it is relatively uncommon in the U.S. It may result from hepatitis C infection. More Information on Liver Cancers: Kidney, Liver & Urinary Cancer
"Hepatocellular Cancer in Children" is more commonly referred to as "Liver Cancer in Children" in the medical community. Liver Cancer in Children
Also Known As: "Pediatric Liver Cancer, Pediatric Hepatocellular Carcinoma, Juvenile Liver Cancer, Hepatoblastoma, Primary Liver Cancer in Children, Juvenile Hepatocellular Carcinoma"
Two types of cancer that form in the tissues of the liver. Hepatoblastoma usually occurs in children under three years old. Hepatocellular carcinoma can occur at any age. More Information on Liver Cancer in Children: Pediatric Cancer
"Hepatocellular Carcinoma" is more commonly referred to as "Liver Cancers" in the medical community. Liver Cancers
Also Known As: "Primary Liver Cancers, Hepatocellular Cancer, Hepatoma"
Cancer of the liver, an organ in the abdomen that aids in digestion and regulates levels of vital substances in blood. While the most common cancer to occur worldwide, it is relatively uncommon in the U.S. It may result from hepatitis C infection. More Information on Liver Cancers: Kidney, Liver & Urinary Cancer
"Hepatoma" is more commonly referred to as "Liver Cancers" in the medical community. Liver Cancers
Also Known As: "Primary Liver Cancers, Hepatocellular Carcinoma, Hepatocellular Cancer"
Cancer of the liver, an organ in the abdomen that aids in digestion and regulates levels of vital substances in blood. While the most common cancer to occur worldwide, it is relatively uncommon in the U.S. It may result from hepatitis C infection. More Information on Liver Cancers: Kidney, Liver & Urinary Cancer
A plant or part of a plant that is used for culinary or medicinal purposes. They are associated with a wide range of effects on the body, although scientific evidence of their safety and effectiveness is lacking. More Information on Herb: Herbs & Supplements
Also Known As: "Phytotherapy, Herbal Remedy, Herbal Supplement"
A non-medicinal approach using herbs, plants and supplements to treat diseases and promote improved health. Herbal supplements are available without a prescription and are not regulated by the Food and Drug Administration (FDA). More Information on Herbal Medicine: Herbs & Supplements
Also Known As: "Phytotherapy, Herbal Supplement, Herbal Medicine"
A non-medicinal approach using herbs, plants and supplements to treat diseases and promote improved health. Herbal supplements are available without a prescription and are not regulated by the Food and Drug Administration (FDA). More Information on Herbal Remedy: Herbs & Supplements
Also Known As: "Herbal Medicine, Phytotherapy, Herbal Remedy"
A non-medicinal approach using herbs, plants and supplements to treat diseases and promote improved health. Herbal supplements are available without a prescription and are not regulated by the Food and Drug Administration (FDA). More Information on Herbal Supplement: Herbs & Supplements
"Herbal Tea" is more commonly referred to as "Tea" in the medical community. Tea
Also Known As: "Green Tea, White Tea, Black Tea, Oolong Tea"
A beverage made with tea leaves and hot water. Four major types (black, oolong, green and white) come from the same plant but are processed differently. Some contain more antioxidants than others. Herbal teas are made from other plants or herbs. More Information on Tea: Functional Foods
Also Known As: "Herbal Supplement, Herbal Medicine, Phytotherapy, Herbal Remedy"
A non-medicinal approach using herbs, plants and supplements to treat diseases and promote improved health. Herbal supplements are available without a prescription and are not regulated by the Food and Drug Administration (FDA). More Information on Herbal Therapy: Herbs & Supplements
A device used to correct severe protrusion of the upper teeth. It is worn over head and attached to the upper and lower molar teeth in a manner that influences jaw growth and tooth positions. It cannot be removed by a patient. More Information on Herbst Appliance: Dental Braces & Alignment
"Hereditary Ataxia" is more commonly referred to as "Friedreich's Ataxia" in the medical community. Friedreich's Ataxia
Also Known As: "Spinocerebellar Ataxia"
An inherited disease that causes progressive damage to the nervous system. The first symptom may be difficulty walking. Symptoms then spread to the arms and trunk and range from muscle weakness and speech problems to heart disease. More Information on Friedreich's Ataxia: Movement Disorders
"Hereditary Cancer Syndromes" is more commonly referred to as "Genetics & Cancer Risk" in the medical community. Genetics & Cancer Risk
Increased knowledge about genetics has helped physicians understand and identify mutations that lead to cancer. Some mutations occur by chance or environmental factors, while others are strongly linked to heredity. More Information on Genetics & Cancer Risk: Cancer Risk Factors
"Hereditary Creutzfeldt Jakob Disease" is more commonly referred to as "Creutzfeldt Jakob Disease" in the medical community. Creutzfeldt Jakob Disease
Also Known As: "CJD, Acquired Creutzfeldt Jakob Disease, Sporadic Creutzfeldt Jakob Disease"
A rare but fatal brain disorder involving mental deterioration. It is a transmissible spongiform encephalopathy (TSE) and can be sporadic, hereditary, acquired or variant (associated with mad cow disease). More Information on Creutzfeldt Jakob Disease: Encephalopathy
"Hereditary Diseases" is more commonly referred to as "Genetic Disorders" in the medical community. Genetic Disorders
Also Known As: "Genetic Diseases, Genetic Defects, Inherited Disorders"
A disorder carried on a patient's genes. They may be due to random mutations of the genes in an egg or sperm, duplication or deletion of a chromosome, or may be passed from parent to child. More Information on Genetic Disorders: Pediatric Health Basics
A genetic condition that causes the body to absorb too much iron, leading to liver disease, diabetes and eventually heart failure. More Information on Hereditary Hemochromatosis: Anemia & Blood Disorders
A rare inherited disorder that increases the risk of certain cancers, including of the uterus and kidneys. It also increases the risk of benign (noncancerous) tumors forming in the uterus and skin. More Information on Hereditary Leiomyomatosis & Renal Cell Cancer Syndrome: Kidney, Liver & Urinary Cancer
"Hereditary Motor and Sensory Neuropathy" is more commonly referred to as "Charcot Marie Tooth Disease" in the medical community. Charcot Marie Tooth Disease
Also Known As: "CMT, HMSN, CMT Disease, Peroneal Muscular Atrophy"
A group of genetic disorders affecting the normal function of the peripheral nerves, which conduct messages from the brain to the limbs. It is most often diagnosed in adolescence. There is no cure, but those affected have a normal life expectancy. More Information on Charcot Marie Tooth Disease: Pediatric Brain & Nerve
A group of inherited disorders of the peripheral nervous system with four subcategories. Symptoms may include numbness and tingling in feet/hands, muscle weakness, scoliosis and autonomic symptoms (e.g., impaired sweating). More Information on Hereditary Neuropathy: Neuropathy
"Hereditary Nonpolyposis Colon Cancer" is more commonly referred to as "Lynch Syndrome" in the medical community. Lynch Syndrome
Also Known As: "HNPCC"
An inherited disorder that puts a person at high risk of developing colon cancer, usually before age 50. It also involves an increased risk of other cancers (e.g., brain, skin, gastrointestinal, biliary, urinary tract, uterine, ovarian). More Information on Lynch Syndrome: Gastrointestinal System Cancer
A group of inherited disorders marked by progressive weakness and leg stiffness. More complicated forms may be accompanied by neurological symptoms such as optic neuropathy, retinopathy, dementia and ataxia. More Information on Hereditary Spastic Paraplegia: Movement Disorders
"Heredopathia Atactica Polyneuritiformis" is more commonly referred to as "Refsum Disease" in the medical community. Refsum Disease
Also Known As: "Phytanic Acid Storage Disease"
A condition in which patients lack the enzyme that breaks down phytanic acid, a substance found in many foods. As a result, toxic levels build up in the body. It is one of a group of genetic diseases called leukodystrophies. More Information on Refsum Disease: Pediatric Brain & Nerve
"Herlitz Disease" is more commonly referred to as "Epidermolysis Bullosa" in the medical community. Epidermolysis Bullosa
Also Known As: "Epidermolysis Bullosa Letalis, Epidermolysis Bullosa Hereditaria, Weber Cockayne Disease"
An inherited, autoimmune condition that causes red blisters that break open, ooze, form scabs and scar. A genetic defect causes the filaments that anchor the epidermis to the dermis to be either absent or improperly functioning. More Information on Epidermolysis Bullosa: Psoriasis & Autoimmune Skin
"Hermaphrodite" is more commonly referred to as "Ambiguous Genitalia" in the medical community. Ambiguous Genitalia
Also Known As: "Intersex Condition, Hermaphroditism"
A genetic mutation that causes a person to be born with external genitalia that do not have a typical appearance and makes specific determination of gender difficult. More Information on Ambiguous Genitalia: Birth & Genetic Disorders
"Hermaphroditism" is more commonly referred to as "Ambiguous Genitalia" in the medical community. Ambiguous Genitalia
Also Known As: "Intersex Condition, Hermaphrodite"
A genetic mutation that causes a person to be born with external genitalia that do not have a typical appearance and makes specific determination of gender difficult. More Information on Ambiguous Genitalia: Birth & Genetic Disorders
The protrusion of an organ through the wall of the cavity that normally contains it. They can occur anywhere in the body but are more common in the abdomen or groin.
"Herniated Bladder" is more commonly referred to as "Cystocele" in the medical community. Cystocele
Also Known As: "Dropped Bladder, Prolapsed Bladder"
A condition in which the bladder droops into the vagina because the wall between the two weakens. It can result from strain (e.g., during childbirth), hormone imbalance (e.g., due to menopause) or other problems. More Information on Cystocele: Urinary & Bladder
Also Known As: "Injured Disc, Disc Prolapse, Protruding Disc, Disc Herniation, Slipped Disc, Ruptured Disc, Prolapsed Disc, Bulging Disc"
A disc in the spine displaced from its normal position in between two vertebrae. Tissue within the disc ruptures and then the disc protrudes into the spinal canal, causing pain, numbness and/or weakness. More Information on Herniated Disc: Back, Neck & Shoulder Pain
"Herniated Uterus" is more commonly referred to as "Uterine Prolapse" in the medical community. Uterine Prolapse
Also Known As: "Dropped Uterus, Prolapsed Uterus"
A condition in which the uterus drops down into the vagina due to a weakening of supportive tissue. Causes may include pregnancy, vaginal delivery, obesity, chronic constipation, excessive coughing, genetics and other factors. More Information on Uterine Prolapse: Uterine & Ovarian Health
A painful mouth infection caused by coxsackieviruses. It typically affects children and is often associated with a high fever. More Information on Herpangina: Oral Infections
Family of viruses known for two in particular -- herpes simplex (produces fluid-filled blisters on the skin and mucous membrane) and herpes zoster (produces painful eruptions and nerve inflammation). More Information on Herpes: Skin Related Infections
"Herpes B" is more commonly referred to as "B Virus" in the medical community. B Virus
Also Known As: "Cercopithecine Herpesvirus, Herpesvirus 1, Herpes B Virus"
An infectious agent commonly found among macaque monkeys. It is rare in humans, but is often fatal when it does occur. People at increased risk for the virus include veterinarians and laboratory workers. More Information on B Virus: Infectious Disease Basics
"Herpes B Virus" is more commonly referred to as "B Virus" in the medical community. B Virus
Also Known As: "Herpes B, Cercopithecine Herpesvirus, Herpesvirus 1"
An infectious agent commonly found among macaque monkeys. It is rare in humans, but is often fatal when it does occur. People at increased risk for the virus include veterinarians and laboratory workers. More Information on B Virus: Infectious Disease Basics
"Herpes Genitalis" is more commonly referred to as "Genital Herpes" in the medical community. Genital Herpes
Also Known As: "HSV2"
A common sexually transmitted disease (STD) that involves the eruptions of blisters on the genitals or mouth. There is no cure. Treatment involves reducing the number of outbreaks. The disease can be spread even when no outbreak is current. More Information on Genital Herpes: STD & Genital Infections
"Herpes Labialis" is more commonly referred to as "Cold Sores" in the medical community. Cold Sores
Also Known As: "Cold Sore Herpes Virus, Cold Sore Virus, HSV1"
Tiny blisters on the lip or inside the mouth on the gums and palate. They are caused by the herpes simplex virus type 1 (HSV1), which is transmitted through person-to-person contact. Patients may have flare-ups with colds and fever. More Information on Cold Sores: Oral Infections
Infections that affect the mouth, nose, buttocks or genital area. They may lie dormant for long periods before recurring. Strains include type 1 (associated with the lips, mouth and face) and type 2 (sexually transmitted). More Information on Herpes Simplex Infection: Skin Related Infections
Infections that affect the mouth, nose, buttocks or genital area. They may lie dormant for long periods before recurring. Some types of herpes may cause fever and inflammation of the gums in children More Information on Herpes Simplex Infection & Children: Skin Related Infections
Infections that affect the mouth, nose, buttocks or genital area. They may lie dormant for long periods before recurring. Strains include type 1 (associated with the lips, mouth and face) and type 2 (sexually transmitted). More Information on Herpes Simplex Viruses: Skin Related Infections
Also Known As: "HSV & Children, Herpes Simplex Infection & Children"
Infections that affect the mouth, nose, buttocks or genital area. They may lie dormant for long periods before recurring. Some types of herpes may cause fever and inflammation of the gums in children More Information on Herpes Simplex Viruses & Children: Skin Related Infections
A complication of shingles infection that occurs when the varicella-zoster virus spreads to the facial nerves. It is marked by intense ear pain, paralysis of facial nerves, and a rash around the ear, mouth, face, neck and scalp. More Information on Herpes Zoster Oticus: Ear, Eye & Face Pain
"Herpes Zoster Shingles" is more commonly referred to as "Shingles" in the medical community. Shingles
Also Known As: "Shingles Virus, Varicella"
A painful rash of patches of skin with small blisters. Anyone who has had chickenpox can develop shingles, as they are caused by the same virus. This condition usually clears within a few weeks. More Information on Shingles: Skin Signs & Symptoms
"Herpesvirus 1" is more commonly referred to as "B Virus" in the medical community. B Virus
Also Known As: "Cercopithecine Herpesvirus, Herpes B Virus, Herpes B"
An infectious agent commonly found among macaque monkeys. It is rare in humans, but is often fatal when it does occur. People at increased risk for the virus include veterinarians and laboratory workers. More Information on B Virus: Infectious Disease Basics
Antidepressants that work by inhibiting the re-absorption of neurotransmitters, particularly norepinephrine and serotonin, by nerve cells. They are often the first line of medications in the treatment of depression. More Information on Heterocyclic Antidepressants: Psychiatric Medications
"Heterogeneous Nuclear RNA" is more commonly referred to as "RNA" in the medical community. RNA
Also Known As: "mRNA, Ribonucleic Acid, hRNA, Transfer RNA, Polynucleotides, Messenger RNA, tRNA"
A substance similar to DNA that is found in every cell of the body. Its functions include protein synthesis and relaying genetic information. There are four main types: heterogeneous (hRNA), messenger (mRNA), transfer (tRNA) and ribosomal (rRNA).
Infection with the trematode Heterophyes heterophyes, a minute intestinal fluke. Humans are infected by ingesting undercooked or salted fish containing metacercariae. More Information on Heterophyes Infection: Gastroenteritis & Food Illness
Self-limited, acute infection of the liver caused by an RNA virus. Symptoms are similar to those of hepatitis A and spread via contaminated drinking water and food. It is endemic to developing countries. More Information on HEV: Liver, Pancreas & Biliary
"Hexagonal Water" is more commonly referred to as "Structured Water" in the medical community. Structured Water
Also Known As: "Clustered Water, Oxygenated Water, Activated Water, Pentagonal Water, Alkanized Water, Hydrogenated Water, Super Ionized Water"
Waters which supposedly have nutritional or spiritual value based on the physical structure of the water's atoms. These claims are widely rejected by the scientific community. More Information on Structured Water: Water & Hydration
"HFCS" is more commonly referred to as "High Fructose Corn Syrup" in the medical community. High Fructose Corn Syrup
A compound composed of 55 percent fructose and 45 percent sucrose that is produced by converting glucose (from corn syrup) to fructose. It is used primarily to sweeten foods and also prevents rapid spoilage of food products. More Information on High Fructose Corn Syrup: Carbs & Sugars
"HFMD" is more commonly referred to as "Hand, Foot & Mouth Disease" in the medical community. Hand, Foot & Mouth Disease
Also Known As: "Vesicular Stomatitis with Exanthem"
Contagious infection caused by the coxsackievirus marked by small blistering oral lesions that progress to the hands, feet and other areas. Usually found in children, lesions due to this disease heal in about a week. More Information on Hand, Foot & Mouth Disease: Skin Related Infections
A distant relative of the hepatitis C virus that may be transmitted through transfusions. Its role in acute and chronic hepatitis remains unclear, and it may not even replicate in the liver. More Information on HGV: Liver, Pancreas & Biliary
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