Men can and do get trichomoniasis, though most infected men never develop symptoms, which contributes to widespread underdiagnosis and continued transmission of the infection.
Trichomoniasis carries an unfair label. Because symptoms in men often stay invisible, the infection gets treated like a women’s issue, or gets mixed up with chlamydia or a plain urinary tract infection. The parasite doesn’t discriminate, and the assumption that it skips men is one reason it spreads so smoothly.
The honest answer is straightforward: yes, men can get trichomoniasis. In fact, the CDC estimates 3.7 million people in the U.S. carry the infection at any given time, and a significant share of them are men who have no idea the parasite is living in their urethra. Here’s what every man should know about symptoms, testing, and treatment.
How the Parasite Spreads to Men
The infection is caused by a protozoan parasite called Trichomonas vaginalis. In men, it typically sets up inside the urethra — the tube that carries urine and semen out of the body. It does not need a cut or a break in the skin; the parasite moves easily through sexual fluids.
Transmission requires genital contact. The parasite is carried in semen, pre-ejaculate, and vaginal fluids, and it passes from person to person during vaginal sex. Urethral contact from an infected partner is the main route, regardless of whether ejaculation happens.
What surprises many people is how common the infection is. The WHO classifies it as the most prevalent nonviral sexually transmitted infection globally, and most infected men will never feel a thing.
Why the “Silent” Reputation Sticks
The reason trichomoniasis flies under the radar for so many men comes down to biology. The parasite can live in the urethra without triggering enough inflammation to notice, so men become unwitting carriers. This silence has consequences.
- Asymptomatic infections: Most infections in men produce zero symptoms. The parasite colonizes the urethra quietly, and routine STI panels typically do not test for it unless requested.
- Symptoms when they appear: Some men do feel something. The most common signs include a thin whitish discharge from the penis, pain or burning during urination, and a feeling of needing to urinate more often.
- Itching and irritation inside the penis: The urethra may feel sore or itchy, and some men notice a burning sensation after ejaculation that is easily brushed off.
- Confusion with other STIs: Trich is not chlamydia, but the symptoms overlap. Because the infection can be missed in men with standard urine tests, it often goes untreated and continues spreading.
- Possible link to fertility: A 2025 study published in PubMed suggests the parasite may contribute to male infertility factors, though researchers note the impact is not yet fully understood.
The bottom line here is that an absence of symptoms does not mean the infection is absent — and untreated trich remains transmissible to partners.
Recognizing the Signs and Getting the Right Test
When symptoms do surface, they can mirror other urethral conditions. The discharge from trich tends to be thinner than the pus associated with gonorrhea, and the irritation may come and go rather than steadily worsen.
Signs worth taking seriously
Discharge from the penis, burning during urination, or a persistent itch inside the urethra all warrant a visit to a healthcare provider. Because these symptoms overlap with UTIs and other STIs, lab testing is the only way to confirm the parasite. Per the CDC, trichomoniasis is the most common nonviral STI in the U.S., Caused by a Protozoan Parasite that requires a specific test to detect in men.
| Symptom | In Men | In Women |
|---|---|---|
| Discharge | Thin, whitish, or clear urethral discharge | Frothy, yellow-green vaginal discharge |
| Pain during urination | Burning or stinging sensation | Painful urination |
| Itching or irritation | Itching inside the penis | Vaginal itching and redness |
| Pain during intercourse | Less common | Common and often reported |
| Asymptomatic rate | Majority of cases | Roughly 50 to 70 percent of cases |
The most sensitive method for diagnosing trich in men is a nucleic acid amplification test (NAAT) performed on a urethral swab. Urine NAAT is widely used and convenient, but some evidence suggests it may be slightly less sensitive in men compared to direct swabbing.
Treatment That Works
The good news is that trichomoniasis is curable. A single dose of oral antibiotics clears the infection for most men, though follow-up may be needed for persistent cases.
- First-line medication: A single 2-gram dose of metronidazole taken orally is the standard treatment for trichomoniasis. For men who still test positive after the single dose and have not been reexposed, a longer course of metronidazole at 500 mg twice daily for seven days is recommended per CDC treatment guidelines.
- Partner treatment is mandatory: Even if a partner has no symptoms, they need treatment at the same time. Skipping partner treatment is the most common reason the infection bounces back.
- No sex until clear: Men should avoid sexual contact until both they and their partner have finished the full course of medication and any symptoms have resolved. Retesting after treatment is sometimes recommended to confirm the parasite is gone.
Abstaining from alcohol while on metronidazole and for 24 hours after the last dose is important — the combination can cause nausea and vomiting. A healthcare provider or pharmacist will flag this interaction during the visit.
Why Routine STD Panels Skip It
Most standard STI screenings include chlamydia and gonorrhea but leave trichomoniasis out. Unless a patient specifically asks for a trich test or reports symptoms, the parasite is never looked for.
Part of the reason is that testing in men has historically been less sensitive, leading some clinics to deprioritize it. But the prevalence data tells a different story. The parasite has been detected in up to 32 percent of incarcerated men and women and up to 17 percent of patients attending STD clinics. MedlinePlus describes the diagnostic process, noting that a Sample of Body Fluid swabbed from the urethra is the standard method for detecting the parasite in men.
Who should consider requesting a test
Men who experience urethral symptoms, those whose partner has been diagnosed with trich, and anyone who has had unprotected sex with multiple partners without recent STI screening should consider asking specifically for trichomoniasis testing.
| Test Method | Procedure | Considerations for Men |
|---|---|---|
| NAAT (TMA) on urethral swab | Swab inserted approximately 2 cm into the urethra | Most sensitive option for men; positive likelihood ratio of 32 |
| Urine NAAT | First-catch urine sample | Convenient but may occasionally miss low-level infections in men |
| Rapid antigen test | Urethral swab read on-site | Fast results, but lower sensitivity than NAAT |
The Bottom Line
Trichomoniasis does not discriminate by gender, and it does not always announce itself. Because most men have no symptoms, the infection passes silently between partners. Curable with a single oral dose and easily detected with a targeted swab or urine test, trich remains one of the most overlooked STIs for men. The biggest obstacle is simply knowing to ask for the test.
Your primary care doctor or a urologist can order the appropriate test — typically a NAAT on a swab or urine sample — and prescribe the course of medication that matches your situation, including guidance on partner treatment to prevent reinfection.
References & Sources
- CDC. “Reference Article” Trichomoniasis is a sexually transmitted infection (STI) caused by a protozoan parasite called *Trichomonas vaginalis*.
- MedlinePlus. “Trichomoniasis Test” Trichomoniasis testing usually looks for the parasite in a sample of body fluid swabbed from the infected area.