What could cause white foamy discharge in females?

White foamy vaginal discharge is most often a sign of trichomoniasis, a common sexually transmitted infection (STI) caused by a microscopic parasite called Trichomonas vaginalis. Other possible causes include bacterial vaginosis or, less commonly, other vaginal infections. Foamy discharge is typically not normal and often signals that medical evaluation is needed.

Key facts about white foamy discharge:

• Most common cause: Trichomoniasis ("trich")
• Other symptoms may include: Itching, burning, unusual odor, or discomfort during urination or sex
• Treatable: Yes, usually with prescription antibiotics
• Contagious: Trichomoniasis spreads through sexual contact

Because foamy discharge can point to several different conditions—each requiring different treatment—it's important to identify the likely cause before deciding on next steps. A free, AI-powered symptom check takes just a few minutes, asks you targeted questions based on your specific symptoms, and provides personalized insights on what might be going on and what to do next. It's a smart, private first step before scheduling a doctor's visit or heading to a clinic.

Reviewed for medical accuracy: 07/15/2026