2. Trichomoniasis

A sexually transmitted infection (STI) caused by a parasite.

Can cause a fishy smell, green/yellow discharge, itching, and discomfort.

Treated with prescription medication.

3. Poor hygiene or trapped sweat

Sweat, tight clothing, or infrequent washing can trap bacteria and moisture.

While not always a “fishy” smell, it can cause an unpleasant odor.

4. Menstruation or leftover tampons

A forgotten tampon can cause a very strong, rotten smell, which may be mistaken for fishy.

When To Worrry

See a doctor if: