Vaginitis is an inflammation of the vagina that causes discharge, itching, and pain. There are three main types: bacterial vaginosis caused by an imbalance of bacteria, yeast infections from the fungus Candida albicans, and trichomoniasis from a parasite spread through sexual contact. Symptoms include abnormal discharge, itching, pain during sex and urination, and light bleeding. Treatment typically involves creams, suppositories, or tablets to restore the vagina's normal balance.