Trichomoniasis is caused by a parasite. An infected person can pass it on to his or her partner during sex.

Risk Factors

Trichomoniasis is more common in women. The risk may be higher for those who:

  • Have more than one sex partner
  • Do not use condoms during sex
  • Have had STIs before



Some people may not have symptoms of trichomoniasis. Others may have:

In women:

  • A bad-smelling, greenish-yellow discharge from the vagina
  • Pain, itching, or burning of the genitals
  • Bleeding after sex
Infection Site in Women
Copyright © Nucleus Medical Media, Inc.

In men:

  • Discharge from the penis
  • Itching or pain
  • Pain when passing urine
  • Pain in the testes or scrotum
Infection Site in Men
Male Urethtra
Copyright © Nucleus Medical Media, Inc.


The doctor will ask about symptoms and health history. You will also be asked about your sexual history. A physical exam will be done. A pelvic exam may also be done.

Tests will be done to look for signs of infection, such as:

  • Women—testing fluid or discharge from the vagina
  • Men—testing urine, semen, or discharge from the penis



The infection is treated with antibiotics. Sex partners may also need treatment.


The risk of trichomoniasis may be lowered by:

  • Always using condoms during sex
  • Only having sex with one person who does not have an STI

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.