References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Trichomoniasis is a common STI caused by the parasite Trichomonas vaginalis. It can cause frothy discharge, itching and discomfort, though up to half of infections are silent. It’s one of the most common curable STIs worldwide and is treated with a short course of metronidazole.
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Key Facts
| Feature | Detail |
|---|---|
| Cause | Trichomonas vaginalis parasite |
| Transmission | Vaginal sex, shared sex toys |
| Symptoms | Frothy discharge, itching, burning — or none |
| Testing | NAAT (urine or swab) |
| Treatment | Metronidazole |
| Curable? | Yes |
Symptoms
- Women: frothy yellow-green discharge, fishy smell, itching, pain during sex
- Men: usually no symptoms; mild discharge or burning possible
- Up to 50% asymptomatic
Treatment
- Metronidazole 400-500mg twice daily for 5-7 days, or single 2g dose
- Avoid alcohol during and 48 hours after
- Partners treated simultaneously
Complications If Untreated
- Increased HIV risk
- Pregnancy complications
- Chronic symptoms
Read more: Full trichomoniasis guide | Testing | Untreated trich
Frequently Asked Questions
Is trichomoniasis an STI?
Yes — transmitted through sexual contact.
Can men get it?
Yes, though often asymptomatic.
Is it curable?
Yes — with antibiotics.
Related reading
- Can You Get Trichomoniasis From a UTI?
- Trichomonas Test Using PCR
- What Is Trichomonal Vaginitis?
- What Happens If Trichomoniasis Is Left Untreated?
- Can Trichomoniasis Be Confused With Chlamydia?
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
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