About one-third to one-half of women infected with trichomoniasis experience no symptoms, according to the National Women’s Health Resource Center. However, other women do experience symptoms, usually between 5 and 28 days after exposure. These symptoms may include:

• Inflammation, irritation and itching in the genital area (vaginitis).
  
  
• Yellow, green or gray vaginal discharge. This is often thick and foamy and sometimes has a strong "fish-like" odor.
  
  
• Discomfort during sexual intercourse or during urination.
  
  
• Soreness or itching of the labia (the “lips” near the entrance to the vagina) and inner thighs. The labia may also be swollen.
  
  
• Lower abdominal pain (in rare cases).
  
  
• Although not visible to the patient, some women may have small red sores in the vagina or on the cervix.

Most men infected with trichomoniasis do not experience symptoms. In some cases, men may have urethritis (inflammation of the urethra), itching of the urethra, dysuria (difficulty or pain during urination) or a slight discharge from the penis. Some men also may experience a slight burning following urination or ejaculation.

A man’s symptoms may disappear after about a week or so, even if he has not received treatment. However, men whose trichomoniasis infections are not treated can continue to infect others until they receive treatment.