Skip to content

Trichomoniasis

Trichomoniasis is a sexually transmitted infection caused by the protozoan Trichomonas vaginalis. Many people have no symptoms, so laboratory testing is more reliable than appearance alone.

Key takeaways

  • Vaginal discharge, irritation or urinary discomfort can occur, while penile infection is often asymptomatic.
  • Other sexually transmitted infections can cause similar symptoms and may coexist, so broader testing may be appropriate.
  • Current sexual partners usually need coordinated evaluation and treatment, with sex avoided until treatment and symptom criteria are met.

Catalogue matches do not confirm trichomoniasis or indicate a safe antiparasitic regimen.

Why does reinfection happen?

An untreated asymptomatic partner can pass the parasite back after treatment. Clear communication, partner treatment and retesting where advised matter more than assuming symptoms have cleared the infection.

How is medicine selected?

Nitroimidazoles such as tinidazole have treatment roles. Pregnancy, breastfeeding, interactions, previous failure and local guidance affect medicine and schedule. Alcohol and medicine instructions should follow the exact prescribed product; see antiparasitics.

When to seek urgent care

Seek prompt care for pregnancy with pelvic pain or bleeding, high fever, severe lower abdominal pain, vomiting, fainting or signs of a severe medicine reaction.