What is Trichomoniasis?
Trichomoniasis: Trichomoniasis is a sexually transmitted infection caused by the parasite Trichomonas vaginalis, passed on through vaginal sex, genital skin contact, and shared sex toys. It is very common, often symptomless, and fully curable with antibiotics.
Also known as: trich, TV, trichomonas infection.
Trichomoniasis stands out among STIs because it is caused by a parasite rather than a virus or bacterium, a microscopic organism called Trichomonas vaginalis that lives in the genitals and urethra. It spreads through vaginal sex without a condom, skin to skin contact of the genital area, and, importantly for anyone who owns a toy drawer, through sharing sex toys between partners without washing them or changing the condom on them.
The tricky part is how quiet it is. Many people get no symptoms at all, so the infection often travels between partners unnoticed, and symptoms that do appear can take 5 to 28 days to show up, sometimes much longer. The good news is equally clear cut: testing is simple, treatment is a short course of antibiotics, and trichomoniasis is completely curable. This entry covers how to recognize it, how it spreads, and the toy hygiene habits that keep it out of your bedroom.
Trichomoniasis Symptoms
In people with a vagina, the most recognizable sign is a yellow-green discharge that may look frothy or smell like fish, along with itching, soreness, swelling, or redness in or around the vagina, pain when peeing or during vaginal sex, and sometimes tummy pain. Because the discharge and smell overlap with bacterial vaginosis, self-diagnosis is unreliable, and a test is the only way to know which one you are dealing with.
In people with a penis, trichomoniasis can cause discharge from the penis, pain when peeing, needing to pee more often, and pain or soreness in the penis, testicles, or bottom, or when ejaculating. That said, the infection is symptomless in a large share of cases in every body, which is exactly why the NHS advises getting tested if you think you might have it rather than waiting for signs that may never come.
How Trichomoniasis Spreads and How to Lower Your Risk
Transmission happens through vaginal sex without a condom, genital skin to skin contact, and sharing sex toys. Using external or internal condoms during sex is the main protection, and the NHS recommends getting tested once a year or whenever you have a new partner. Having had trichomoniasis before gives you no immunity; you can catch it again.
The toy rule deserves its own paragraph, because trich is one of the clearest cases where toy hygiene is STI prevention. Do not share toys between partners without washing them between uses or covering them with a fresh condom for each person. Non-porous body safe materials like silicone, glass, and stainless steel are easiest to clean properly, and a wash with warm water and mild soap or a toy cleaner between users, or a new condom each time, breaks the transmission chain completely.
Getting Tested for Trichomoniasis
Testing happens at a sexual health clinic or GP surgery and is quick: a doctor or nurse asks about symptoms and partners, and takes a swab sample from the vagina or penis, which you may be able to do yourself, or asks for a urine sample. You can ask to be tested even with no symptoms, and clinics will usually offer tests for other STIs at the same time since infections often travel together.
If the test comes back positive, your current and recent partners need treatment too, otherwise you simply pass it back and forth. Clinics can help you notify partners anonymously, without naming you, which removes most of the awkwardness from that conversation.
How Trichomoniasis Is Treated
Treatment is a course of antibiotics, usually metronidazole, taken either twice a day for 7 days or as a single larger dose. Symptoms typically start improving within a few days, but finish the full course even when you feel better, and if symptoms persist you may need a second course.
One rule matters more than any other for actually clearing the infection from a relationship: do not have sex until at least one week after you and your partners have all finished treatment. Restarting sooner is the classic way couples reinfect each other and end up back at the clinic wondering why the antibiotics did not work.
Why Treating It Matters
Left untreated, trichomoniasis is more than an annoyance. It raises the chance of getting or passing on HIV, makes bacterial vaginosis more likely, and can lead to pelvic inflammatory disease, which in turn can cause chronic pelvic pain, ectopic pregnancy, or infertility. In people with a penis it can inflame the prostate gland.
In pregnancy the stakes are higher still: untreated trichomoniasis is linked to premature birth and low birthweight, can be passed to the baby during delivery, and increases the risk of sepsis after giving birth. If you are pregnant or planning to be and think you might have trich, that is a see-your-doctor-now situation, not a wait-and-see one.
Trichomoniasis vs Bacterial Vaginosis: Quick Comparison
| Trichomoniasis | Bacterial Vaginosis | |
|---|---|---|
| Cause | A parasite (Trichomonas vaginalis) | An imbalance of the vagina's natural bacteria |
| Is it an STI? | Yes, passed through sex and shared toys | No, though sex can trigger it |
| Discharge | Yellow-green, sometimes frothy, fishy smell | Thin, grayish white, fishy smell |
| Other symptoms | Itching, soreness, pain when peeing or during sex | Often none beyond discharge and odor |
| Partner treatment | Yes, current and recent partners need treating | Not usually required |
Key Things to Know
- Trichomoniasis is caused by a parasite and spreads through vaginal sex, genital skin contact, and shared sex toys, so toy hygiene is genuinely part of prevention here.
- Many people have no symptoms at all, and the ones that do appear can take 5 to 28 days or longer, so a yearly test or a test with each new partner is the only reliable check.
- It is fully curable with a short course of antibiotics, but the course must be finished and all partners treated, or you will pass it back and forth.
- No sex until at least a week after everyone has finished treatment, since restarting early is the most common way reinfection happens.
- Untreated trich raises the risk of HIV transmission, pelvic inflammatory disease, and pregnancy complications, which is why it is worth treating even without symptoms.
FAQ
Can you get trichomoniasis from sex toys?
Yes. The NHS lists sharing sex toys as one of the ways trichomoniasis passes between people, alongside vaginal sex and genital skin contact. The fix is simple: wash toys between users or cover them with a new condom each time, and choose non-porous materials like silicone, glass, or stainless steel that can be cleaned thoroughly. A toy that only one person uses poses no trich risk at all.
Do condoms protect against trichomoniasis?
Using external or internal condoms during sex significantly lowers the risk and is the NHS's first prevention recommendation. Because the parasite can also spread through genital skin contact beyond what a condom covers, protection is strong but not absolute. Pairing condoms with regular testing is the most realistic protection strategy.
Could I have trichomoniasis without symptoms?
Yes, and it is common: many people with trichomoniasis notice nothing at all, and symptoms that do come can take 5 to 28 days or much longer to appear. You can pass the infection on during that whole time. Testing once a year, or whenever you have a new partner, is the only reliable way to know your status.
Will trichomoniasis go away on its own?
No, you should not count on that. Symptoms can fade and return, but the infection generally needs antibiotics to clear, and while it lingers you can still pass it on and it can cause complications. Treatment is short, cheap, and effective, so there is no upside to waiting it out.
Does my partner need treatment too?
Yes. Current and recent partners need treating at the same time, otherwise the infection bounces back and forth between you no matter how well your own antibiotics worked. Clinics can contact previous partners anonymously on your behalf. And everyone should wait until at least a week after finishing treatment before having sex again.
Can trichomoniasis affect pregnancy?
Yes. Untreated trichomoniasis during pregnancy is linked to premature birth and low birthweight, the infection can pass to the baby during delivery, and there is a higher chance of sepsis after giving birth. If you are pregnant or trying to conceive and think you may have been exposed, see a doctor or sexual health clinic promptly, since treatment is safe and effective.
Related Terms
Sources
- NHS: “Many people get no symptoms at all, so it's important to get tested if you think you might have trichomoniasis.”
- NHS: “do not share sex toys – wash them between uses and cover them with a new condom each time”
- NHS: “Do not have sex until at least 1 week after you and any sexual partners have finished treatment.”
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