A yeast infection is an infection that occurs when there is too much yeast present in the vagina (although men can also get yeast infections; they can also develop in the throat or mouth). The vagina naturally contains many bacteria as well as a small amount of yeast. However, when those bacteria become unbalanced, an overgrowth of yeast can occur. Symptoms of a yeast infection include itching and soreness in the vaginal area, and possibly a burning sensation during urination. Thick, white vaginal discharge resembling cottage cheese may also be present.
Yeast infections are quite common and in most cases they are not serious.