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Trichomonas vaginalisTrichomoniasis is a sexually transmitted infection that is caused by a protozoa called Trichomonas vaginalis. Both men and women can get trichomonas, but it is more commonly found in women.

Trichomoniasis can be cured with antibiotics.

For more information on symptoms, causes, treatments and prevention see the Overview section.

Information for Health Professionals

Trichomoniasis is a sexually transmitted infection (STI) that is caused by a one-cell organism (protozoan). It is sometimes called a Trichomonas infection or trich (pronounced "trick"). 

Both men and women can get a trich infection, but it is more common in women. Trich in pregnant women can cause problems with the pregnancy.


Many women and most men do not have any symptoms of trich. But if there are symptoms, they usually start within 1 week after infection. In some cases, it can take 1 to 6 months for symptoms to start. 

In women, symptoms include a greenish-yellow, frothy vaginal discharge with a different odour, vaginal itching, and pain during urination or sex. 

In men, symptoms include discharge from the penis, irritation at the tip of the penis, and a burning feeling during urination.


Trich is caused by a one-cell protozoan and passes from one person to another through unprotected sexual contact.  The infection is most commonly found in the urethra in men and the vagina in women.

  • may be associated with infertility or lower sperm count in men
  • can increase the chances of pelvic infections
  • can increase the risk of getting other STIs and HIV
  • in pregnancy, may cause premature birth and/or low birth weight of baby

Your doctor can tell if you have trich by asking about your symptoms and doing a physical examination.  Lab tests may be ordered to find the parasite that causes trichomoniasis.

In women, the parasite may sometimes be found during a routine Pap test.


Trichomoniasis is usually treated with antibiotics. 


You can reduce your risk of spreading or becoming infected with trichomoniasis by practicing safe sex:

  • Avoid sexual contact if you or your partner have symptoms of an STI or are being treated for an STI.
  • Your risk for an STI increases if you have several sex partners.
SOURCE: Trichomoniasis ( )
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