Trichomoniasis in Men and Women: Signs and Treatment

Trichomoniasis is the most common curable sexually transmitted infection in the world. According to the WHO, there are an estimated 156 million new cases each year, a figure that exceeds chlamydia, gonorrhea, and syphilis individually. Despite those numbers, the vast majority of people who carry the infection are entirely unaware of it.

That absence of symptoms is precisely what allows trichomoniasis to persist. The infection passes easily between partners during intercourse, and without proper testing, it can go undetected for months or even years. Once confirmed through a simple laboratory test, however, it responds well to a short course of prescription medication, making early diagnosis the most important step in both treatment and prevention.

What Is Trichomoniasis?

Trichomoniasis, often shortened to “trich,” is a sexually transmitted disease, commonly referred to as an STD, caused by a parasite called Trichomonas vaginalis. The terms STD and STI are often used interchangeably, with STI referring to sexually transmitted infection. Unlike bacterial STIs such as chlamydia or gonorrhea, trichomoniasis is caused by a protozoan, a single-celled organism that specifically targets the urogenital tract.

The infection passes from person to person through intercourse, affecting the vagina in women and the urethra in men. Despite its prevalence, trichomoniasis receives far less public health attention than other sexually transmitted infections. It is not a nationally reportable condition in many countries, including the United States, which means epidemiological data is often drawn from population-based studies rather than routine surveillance.

One important clinical point: trichomoniasis will not resolve on its own. Without treatment, the infection can persist for months or longer, continuing to spread to partners even in the complete absence of symptoms. Left untreated, it is also associated with an increased risk of acquiring other STIs, including HIV, as well as complications during pregnancy. Testing and treatment are essential regardless of whether symptoms are present.

Trichomoniasis Symptoms in Women

Many women with trichomoniasis have no symptoms at all. More than 50% of women with the infection present with vaginal discharge, but a substantial proportion show no signs at all. When symptoms do appear, they are often difficult to ignore.

The most recognizable sign is a frothy, greenish-yellow trichomoniasis discharge with a strong, unpleasant odor that distinguishes it from normal vaginal discharge. Other common symptoms include:

• Itching, redness, or soreness around the vagina
• Discomfort or pain during intercourse
• A burning sensation when urinating

These symptoms typically appear between 5 and 28 days after exposure, although some women show no signs at all while carrying the infection. For those who do develop symptoms, they may become more noticeable around the time of menstruation. The variability in presentation is one of the reasons trichomoniasis so frequently goes undiagnosed without a laboratory test.

Trichomoniasis Symptoms in Men

Trichomoniasis in men typically produces no noticeable symptoms, which makes it straightforward to carry and transmit the infection to a partner without either person being aware. When symptoms do present, they tend to be mild and are easily attributed to other causes.

Possible signs include:

• Irritation or itching inside the penis
• Unusual or thin discharge
• A burning feeling during or after urination

In rare cases, untreated trichomoniasis in men may lead to complications such as urethritis or prostatitis, though this is uncommon. The far more typical scenario is that the infection remains entirely silent, and most men only discover they have it after a partner receives a positive test result.

How Trichomoniasis Is Diagnosed

Trichomoniasis is confirmed through a simple swab or urine sample rather than by symptoms alone, which is important given that so many cases produce no visible signs. Without a laboratory test, many infections would go entirely undetected.

The most accurate option is a nucleic acid amplification test, which detects the genetic material of the parasite directly and offers both high sensitivity and specificity. Some clinics provide rapid or same-day processing, meaning patients can receive a confirmed result within hours rather than waiting days.

Since STD infections such as trichomoniasis frequently appear alongside other sexually transmitted infections, doctors will often recommend testing for multiple infections in the same visit. The scope of that screening depends on the patient’s exposure history, symptoms, and individual risk profile.

Trichomoniasis Treatment and Medication

Trichomoniasis treatment is straightforward and highly effective. The infection is cleared with prescription antibiotics for trichomoniasis, most commonly metronidazole, with tinidazole available as an alternative. Both belong to a class of antimicrobial agents called nitroimidazoles.

The recommended approach differs between males and females. For trichomoniasis treatment for females, the CDC recommends a seven-day course of metronidazole, which has been shown to be significantly more effective at clearing the infection than a single dose. For males, a single dose of metronidazole remains the standard recommendation.

Several important guidelines should be followed during treatment:

• Both partners require treatment at the same time to prevent reinfection, even if one partner has no symptoms
• The full course of medication should be completed, even if symptoms resolve before the course is finished
• Intercourse should be avoided until treatment is complete and all symptoms have fully cleared
• Alcohol should be avoided while taking the medication, as it may cause adverse reactions

When both partners follow these steps, the cure rate is high and reinfection is unlikely. In the rare event that symptoms persist after completing the full course, a follow-up visit is recommended, as resistant strains do exist and may require an alternative medication or adjusted dosing.

Early Testing Makes the Difference

Trichomoniasis is one of those infections that rarely announces itself. It is common, often produces no visible signs, and responds well to treatment once confirmed. The difficulty is that without a test, most people have no way of knowing they carry it, and every day it goes undetected is another opportunity for it to pass to a partner. That is what makes early testing the most effective step anyone can take.

For patients who want answers quickly, H.U.M. Clinic provides a same day STD test in Bangkok with results often available within hours. Every appointment is handled confidentially by English-speaking doctors who review results in detail and, where needed, can prescribe treatment during the same visit. The clinic is designed for patients who value privacy, with a discreet, judgment-free environment conveniently located near BTS Asok and MRT Sukhumvit.

Put your mind at rest at H.U.M. Clinic Bangkok. Book your same-day STD test via LINE, WhatsApp, phone at 098 983 2949, or email at [email protected].

References

1. Trichomoniasis. Retrieved 16 July 2026, from https://www.who.int/news-room/fact-sheets/detail/trichomoniasis
2. Sexually Transmitted Infections. Retrieved 16 July 2026, from https://www.who.int/news-room/fact-sheets/detail/sexually-transmitted-infections-(stis)
3. Trichomoniasis. Retrieved 16 July 2026, from https://www.cdc.gov/std/treatment-guidelines/trichomoniasis.htm
4. Diagnosis and Management of Trichomonas vaginalis: Summary of Evidence Reviewed for the 2021 Centers for Disease Control and Prevention Sexually Transmitted Infections Treatment Guidelines. Retrieved 16 July 2026, from https://pmc.ncbi.nlm.nih.gov/articles/PMC9006969/
5. Guidelines for the Management of Symptomatic Sexually Transmitted Infections. Retrieved 16 July 2026, from https://www.ncbi.nlm.nih.gov/books/NBK572654/

Frequently Asked Questions About Trichomoniasis

What is trichomoniasis and how does it spread?

Trichomoniasis is a sexually transmitted infection caused by the parasite Trichomonas vaginalis. It spreads through intercourse and is the most common curable STI in the world, with the WHO estimating around 156 million new cases each year. Most people who carry it show no symptoms, which is why it passes so easily between partners.

What does trichomoniasis discharge look like?

In women, trichomoniasis can produce a frothy, greenish-yellow discharge with a strong, unpleasant odor. In men, discharge is less common and tends to be thin or clear when present. Not everyone experiences discharge, so a laboratory test remains the only reliable way to confirm the infection.

Can men have trichomoniasis without knowing?

Yes. Trichomoniasis in men usually produces no noticeable signs. Many men only find out after a partner tests positive, which is why testing both partners is essential even when one person feels completely well.

Are there STD tests with instant results for trichomoniasis?

Some clinics offer rapid or same-day results for trichomoniasis and other STIs, though the most accurate method is a laboratory-based nucleic acid amplification test, which may take a few hours to process. Turnaround times vary by clinic, so it is worth confirming with your provider how quickly results will be available.