by Amy Scholten, MPH
Trichomoniasis is a sexually transmitted infection (STI).
It is caused by a parasite. It passes between people during sex.
It is more common in women than men. The risk may be higher for those who:
The infection does not always cause symptoms. When they happen, they may be:
The doctor will ask about your symptoms, and sexual and health history. A physical exam will be done. It will focus on the pelvic area.
A lab will check the samples for the parasite.
The infection is treated with antibiotics. Sex partners may also need treatment.
The risk of STIs is reduced by:
Centers for Disease Control and Prevention
The American Congress of Obstetrics and Gynecology
Sex & U—The Society of Obstetricians and Gynaecologists of Canada
The Sex Information & Education Council of Canada
Mercer F, Johnson PJ. Trichomonas vaginalis: pathogenesis, symbiont interactions, and host cell immune responses. Trends Parasitol. 2018;34(8):683-693.
Sexually transmitted diseases. National Institute of Allergy and Infectious Diseases website. Available at: https://www.niaid.nih.gov/diseases-conditions/sexually-transmitted-diseases. Accessed February 3, 2021.
Trichomoniasis. Centers for Disease Control and Prevention website. Available at:
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Accessed February 3, 2021.
Trichomoniasis. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/trichomoniasis. Accessed February 3, 2021.
Last reviewed September 2020 by David L. Horn, MD, FACP
Last Updated: 2/3/2021
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