How do i know if i have a yeast infection?

Itching, irritation: The main symptoms of vaginal yeast infections are itching and irritation, sometimes with redness and swelling of the labia minor. There can be vaginal discharge, but usually not much -- typically thick and white, sometimes compared to cottage cheese. Strong odor or large amount of discharge suggest other infections, including STDs, but not yeast. See a doctor if you have any of these symptoms.