Trichomoniasis is a common sexually transmitted infection caused by the parasite Trichomonas vaginalis. It can cause frothy yellow-green discharge, a strong odor, itching and pain when urinating, but many women have no symptoms. It is diagnosed with a vaginal swab PCR test and cured with prescription metronidazole, with partners treated at the same time.
- Cause
- Trichomonas vaginalis parasite
- Symptoms
- Discharge, itching, odor, or none
- Test
- Vaginal swab PCR
- Treatment
- Metronidazole, often 7 days
- Partners
- Treat at the same time
- Retest
- About 3 months later
What is trichomoniasis?
Trichomoniasis ("trich") is caused by a single-celled parasite passed on through vaginal sex and genital contact. In women it infects the vagina, vulva, cervix and urethra. It is one of the most common curable STIs worldwide, and infection can last months or years if not treated.
Having trichomoniasis increases the risk of acquiring other STIs, including HIV, and in pregnancy is linked to preterm birth and low birth weight.
Symptoms and how it compares with other causes
- Frothy, yellow-green or gray discharge, sometimes with a strong odor
- Itching, burning or soreness of the vulva and vagina
- Pain when passing urine or during sex
- Small red spots on the cervix (seen on examination)
Symptoms overlap with bacterial vaginosis and yeast infection, so testing is the only reliable way to know. See our overview of vaginal infections for a comparison.
Testing and treatment at Yoonho
- Consultation in English Discussion of symptoms, partners and timing.
- Vaginal swab A swab for PCR testing, which is far more sensitive than looking under a microscope. Other STIs can be tested from the same visit — see the STD test panel.
- Prescription Metronidazole tablets, usually for 7 days for women. Alternatives are available for allergies.
- Partner treatment Current and recent partners should be treated at the same time, even without symptoms.
- Retest Testing again about 3 months after treatment is recommended because reinfection is common.
- Frothy or yellow-green discharge
- Itching and soreness
- Pain when urinating or during sex
- Risk of passing it to partners
- Aims to clear the parasite fully
- Symptoms usually settle in days
- Partners treated together
- Retest plan to prevent reinfection
Treatment options at a glance
| Situation | Usual approach | Notes |
|---|---|---|
| Women, not pregnant | Metronidazole, 7-day course | Preferred over single dose in women |
| Pregnancy | Metronidazole | Considered appropriate in pregnancy; discuss with your doctor |
| Breastfeeding | Metronidazole with advice on timing | Your doctor will explain |
| Treatment failure | Longer or higher-dose course, or alternative drug | After checking for reinfection |
Your doctor will advise whether to avoid alcohol during treatment. Avoid sex until you and your partners have finished treatment and symptoms have gone.
Prevention and when to come back
- Use condoms with new or casual partners.
- Get tested with a new partner, and make sure partners are treated after a diagnosis.
- Do not douche; it does not prevent infection and can upset vaginal balance.
Cost and documents for international patients
At Yoonho Women's Hospital in Apgujeong, Seoul, a consultation with tests is about ₩30,000–100,000 and medication about ₩10,000–50,000 as a general guide; full STD panels cost more, and a written estimate is given after consultation. English receipts and diagnosis notes are available for insurance claims.
Why international patients choose Yoonho
Frequently asked questions
Can men have trichomoniasis?
Yes, though men usually have no symptoms. This is why partners are treated at the same time, even if they feel well.
Can trichomoniasis go away on its own?
It rarely clears without treatment in women and can persist for months or years, so treatment is recommended.
Can I drink alcohol while taking metronidazole?
Ask your doctor. Avoiding alcohol during treatment and for a short time afterwards has traditionally been advised to prevent nausea and other reactions.
Will a Pap test detect trichomoniasis?
Sometimes trichomonas is noted on a Pap test, but it is not a reliable way to diagnose it. A PCR swab is recommended.
Is trichomoniasis treatment available in Korea without a prescription?
No, metronidazole requires a prescription in Korea. A same-day visit at Yoonho can test, diagnose and prescribe with explanations in English.
OB-GYN Specialist · Director of OB-GYN
M.D., Ewha Womans University College of Medicine · Former Clinical Instructor, Ewha Womans University Mokdong Hospital · Member, Korean Society of Menopause
Last reviewed: . This page is for general information and does not replace an in-person consultation.
Talk to an English-speaking gynecologist
Yoonho Hospital · 304 Apgujeong-ro, Gangnam-gu, Seoul · Mon–Fri 9:00–18:00, Sat 9:00–13:00 · Walk-ins welcome.