Definition

Trichomoniasis is a sexually transmitted infection (STI).

Causes

It is caused by a parasite. It passes between people during sex.

Risk Factors

It is more common in women than men. The risk may be higher for those who:

• Have many sex partners
• Do not use condoms with sex
• Have had STIs before

Symptoms

The infection does not always cause symptoms. When they happen, they may be:

In women:

• A bad-smelling, greenish-yellow discharge from the vagina
• Pain, itching, or burning of the genitals
• Bleeding after sex

Infection Site in Women Copyright © Nucleus Medical Media, Inc.

In men:

• Discharge from the penis
• Itching or pain
• Pain when passing urine
• Pain in the testes or scrotum

Infection Site in Men Copyright © Nucleus Medical Media, Inc.

Diagnosis

The doctor will ask about your symptoms, and sexual and health history. A physical exam will be done. It will focus on the pelvic area.

Testing involves:

• Women—testing fluid or discharge from the vagina
• Men—testing urine, semen, or discharge from the penis

A lab will check the samples for the parasite.

Treatment

The infection is treated with antibiotics. Sex partners may also need treatment.

Prevention

The risk of STIs is reduced by:

• Always using condoms during sex
• Only having sex with one person