Trichomoniasis (or its nickname “trich”) is a common sexually transmitted infection of the vagina or penis.


Trich is a parasite that spreads through vaginal fluids and semen. People get trich through vaginal sex without a condom.

Symptoms & Complications

Symptoms can be more noticeable in the vagina than the penis, but both are at risk for contracting and transmitting the infection. Symptoms include a yellow or green discharge with a fishy odor coming from the penis or vagina.


If you are experiencing symptoms or think you’ve been exposed to trich, it’s important to get tested. Medical providers will do a pelvic exam or take a sample of discharge. Under a microscope, providers can detect the parasites causing the infection.


Trich is curable and treatable with oral medication. It’s important to finish the entire course of medication, even if symptoms go away.

Learn More

For detailed information on each infection, check the Center for Disease Control. You can also ask us an anonymous question right on our website. If you are experiencing symptoms of an STI, think you’ve been exposed to an STI, or want to talk to a professional, call Teen Clinic to make an appointment with a qualified health care provider.