Trichomonas Vaginitis

Trichomonas vaginal infection is often called “trich.” It is caused by a parasite that is passed during sex. This makes trich a sexually transmitted infection (STI). Both men and women can get trich, but it is more common in women.

Most people who have trich don’t have any symptoms at first. If symptoms do occur, they may take weeks or months to develop.

Symptoms in women can include:

  • Thin discharge from the vagina that may smell bad and be clear, white, gray, green, or yellow in color
  • Itching, burning, redness, or soreness in or around the vagina
  • Pain in the lower belly
  • Frequent urination or pain and burning during urination
  • Pain during sex

Symptoms in men are not very common. Men may have trich and pass it to women during sex without knowing they were ever infected.

Trich is most often treated with antibiotics. Without treatment, trich can increase the risk of more serious health problems such as:

  • Pelvic inflammatory disease (PID)
  • Preterm delivery (giving birth to a baby early if you’re pregnant)
  • HIV and certain other STIs

Home care

  • Take the antibiotics you’re prescribed exactly as directed. Finish  all of the medicine, even if your symptoms go away.
  • Don’t drink alcohol until you’re done with your treatment.
  • Tell any partners you have sex with that you have trich. They will need to be tested for trich and possibly treated as well.
  • Don’t have sex until 7 to 10 days after you and any partners you have sex with are confirmed to have been treated.


The only way to prevent getting trich or any other STI is to not have sex. If you choose to have sex, then take steps to lower your health risks:

  • Use condoms when having sex.
  • Limit the number of partners you have sex with.
  • Get tested regularly for STIs. Ask any partner you have sex with to do the same.
  • Don’t have sex with anyone who has symptoms that may be due to an STI.

Follow-up care

Follow up with your healthcare provider, or as advised. Testing will likely be done to ensure that the infection has cleared.

When to get medical advice

Call your healthcare provider right away if:

  • You have a fever of 100.4ºF (38ºC) or higher, or as directed by your provider.
  • Your symptoms get worse, or they don’t go away even after completing your treatment.
  • You have new pain in the lower belly or pelvic region.
  • You have side effects that bother you or a reaction to the medicine you’re taking.
  • You or any partners you have sex with have new symptoms, such as a rash, joint pain, or sores.