Trichomoniasis symptoms typically appear 5 to 28 days after exposure, but the majority of infected people never notice symptoms at all. Around 70% to 85% of people with trich have minimal or no signs of infection, which means waiting for symptoms is not a reliable way to know whether you have it.
The 5-to-28-Day Window
When symptoms do appear, they most commonly show up within that 5-to-28-day range after sexual contact with an infected partner. But “most commonly” is doing a lot of work in that sentence. Some people develop symptoms weeks or even months later, and symptoms can come and go over time. Unlike infections with a predictable timeline, trich is unpredictable. You might feel fine for months and then suddenly notice irritation or discharge as the parasite population grows or your body’s immune response shifts.
The parasite responsible, Trichomonas vaginalis, is a single-celled organism that lives in the urogenital tract and reproduces by dividing in two. It doesn’t form a dormant stage the way some parasites do, so it’s actively multiplying from the moment of infection. How quickly that multiplication triggers noticeable inflammation varies from person to person.
Symptoms in Women vs. Men
Women are more likely to develop noticeable symptoms than men, though most women with trich are still asymptomatic. When symptoms do appear in women, they include itching, burning, redness, or soreness around the genitals, discomfort while urinating, pain during sex, and vaginal discharge that may be thin or frothy with a fishy smell. The discharge can be clear, white, yellow, or green. Some women also experience lower abdominal pain.
Men rarely develop symptoms. When they do, the signs are subtle: mild itching or irritation inside the penis, burning after urination or ejaculation, and occasionally a clear or pus-like discharge. Because symptoms in men tend to be so mild or absent entirely, men often carry and transmit the infection without knowing it.
Why You Can’t Rely on Symptoms Alone
The 70% to 85% asymptomatic rate makes trich unusual among common STIs. Untreated infections can persist for months to years without producing any obvious signs. During that entire time, the infection is transmissible to sexual partners. This is why testing matters more than symptom-watching for trichomoniasis. If you’ve had a potential exposure, getting tested is the only way to know for sure.
When to Get Tested After Exposure
Testing too early after exposure can produce a false negative because the parasite population may not yet be large enough to detect. A test taken at least one week after exposure will catch most infections. Waiting a full month after exposure catches nearly all of them. If you test negative at one week but still have concerns, repeating the test at the four-week mark gives you the most reliable result.
For women, testing is typically done with a vaginal swab. Nucleic acid amplification tests (NAATs) are the most sensitive option and can also be used for men, though trich testing in men is less routinely offered. If you’re concerned about exposure, you may need to specifically request a trichomoniasis test, as it’s not always included in standard STI panels.
What Happens Without Treatment
Trich doesn’t resolve on its own. Without treatment, the infection lingers for months or years, even if you never feel a thing. The ongoing inflammation, whether you notice it or not, increases vulnerability to other sexually transmitted infections. Untreated trich during pregnancy can also lead to complications including preterm delivery and low birth weight.
Treatment and Recovery Timeline
Trichomoniasis is curable with prescription antiparasitic medication, typically taken as a single dose or a short course over several days. Most people notice symptoms improving within a few days of starting treatment, though you should avoid sexual contact for at least 7 days after completing treatment to prevent reinfection.
Reinfection is common. The CDC recommends retesting three months after treatment to check for repeat infection, particularly for women. Having trich once doesn’t give you any immunity, so reinfection from an untreated partner or a new partner is always possible. Making sure all current sexual partners are treated at the same time is the most effective way to prevent the cycle from continuing.