Trichomoniasis Symptoms in Men: The STD Your Test Might Miss

Most men with trichomoniasis have no symptoms at all. When symptoms do appear, they typically include burning after urination, mild urethral discharge, and urethral irritation — symptoms that closely mimic chlamydia and gonorrhea. The problem is compounded by the fact that standard STD panels in men often do not test for trichomoniasis, making it one of the most underdiagnosed sexually transmitted infections in the male population.

Trichomoniasis is caused by the protozoan parasite Trichomonas vaginalis — not a bacterium or virus. It is the most common curable STI in the world, with an estimated 156 million new cases globally each year. Yet most clinical attention is focused on women, where the infection causes more pronounced symptoms. In men, trich often flies completely under the radar — untreated, undiagnosed, and silently transmitted to partners.

What Does Trichomoniasis Look Like in Men?

An estimated 70-80% of men with trichomoniasis are completely asymptomatic. Among those who do develop symptoms, the presentation includes:

• Burning or stinging during urination — the most commonly reported symptom

• Clear, white, or slightly yellowish urethral discharge — typically mild and intermittent, easily dismissed or missed

• Urethral irritation or itching — a vague discomfort that may come and go

• Discomfort after ejaculation

• Mild penile irritation or redness — uncommon but documented

These symptoms overlap substantially with non-gonococcal urethritis (NGU), which is typically attributed to chlamydia or mycoplasma genitalium. When standard treatment for NGU does not resolve symptoms, trichomoniasis should be considered — but often is not.

Why Is Trichomoniasis Underdiagnosed in Men?

• Most men are asymptomatic — no symptoms means no clinical trigger to test

• Standard panels miss it — most clinic-based STD testing for men covers chlamydia, gonorrhea, syphilis, and HIV. Trichomoniasis is typically not included.

• Culture is less sensitive in men — traditional wet mount microscopy and culture have poor sensitivity for detecting trich in male urine and urethral samples. Nucleic acid amplification tests (NAATs) are far more sensitive but are not universally available for this indication in men.

• Spontaneous clearance can occur — some men may transiently clear the organism, only to be reinfected by an untreated partner

How Do Men Get Tested for Trichomoniasis?

The most reliable test for trichomoniasis in men is a NAAT (nucleic acid amplification test) performed on a first-void urine sample or urethral swab. NAAT is significantly more sensitive than wet mount or culture in male specimens. If you are requesting trichomoniasis testing, specifically ask for NAAT/PCR — a wet mount alone may miss the infection.

How Is Trichomoniasis Treated in Men?

Treatment is straightforward:

• Metronidazole 2 g orally in a single dose — the standard CDC-recommended treatment

• Alternative: Tinidazole 2 g orally in a single dose — similarly effective

Critical points: sexual partners must be treated simultaneously, and both partners should abstain from sex for at least 7 days after treatment. Do not consume alcohol during metronidazole treatment and for 24 hours after — the combination causes severe nausea and vomiting. For retesting guidance, see our guide on when to retest after STI treatment.

When to Seek Urgent Care

• Burning after urination + discharge in a man whose female partner was diagnosed with trich — treat immediately, even without a positive test result, given the high concordance rate

• Recurrent urethritis not responding to chlamydia/gonorrhea treatment — consider trichomoniasis and request NAAT testing specifically

Frequently Asked Questions

Can men carry trichomoniasis without symptoms?

Yes — the majority of men with trichomoniasis (70-80%) have no symptoms. They can carry and transmit the parasite without any awareness of infection. This is why partner treatment is essential when trich is diagnosed in either partner.

Can trichomoniasis go away on its own in men?

Some men may transiently clear the infection without treatment, but this is unreliable. Untreated trich can persist, recur, and continue to be transmitted to partners. Treatment is simple, effective, and recommended whenever the infection is identified.

How long can a man have trichomoniasis without knowing?

Potentially months or longer. Because the infection is often asymptomatic in men and is not included in routine testing, some men carry trich for extended periods without diagnosis. See our guide on trichomoniasis window period for more.

How do men get tested for trichomoniasis?

The best test is a NAAT/PCR on a first-void urine sample. This is more sensitive than culture or wet mount in male specimens. Specifically request trichomoniasis NAAT testing, as standard STD panels typically do not include it.

The Bottom Line

Trichomoniasis in men is common, usually asymptomatic, and routinely missed by standard STD testing. If your female partner has been diagnosed with trich, you should be treated regardless of your own test results. If you have persistent urethritis that does not respond to standard treatment, trichomoniasis should be on the differential. Comprehensive testing that includes trichomoniasis NAAT is the most reliable way to rule it in or out.