Vaginal discharge is common in women from reproductive age onward and is often a normal part of the body's natural functioning. The amount and consistency of discharge may vary depending on the menstrual cycle, hormonal changes, pregnancy, and ovulation. Discharge that is generally clear or white, without a noticeable unpleasant odor and without itching or pain, is usually considered normal. However, changes in the color, odor, amount, or consistency of vaginal discharge should be evaluated carefully. Yellow, green, gray, or bloody discharge; thick discharge with an unpleasant odor; or frothy or cottage-cheese-like discharge may be associated with vaginal infections or other gynecological conditions. Medical evaluation may also be necessary when discharge is accompanied by symptoms such as itching, burning, painful urination, pain during sexual intercourse, or pelvic or abdominal pain. In some cases, sexually transmitted infections can also cause abnormal vaginal discharge. Abnormal vaginal discharge during pregnancy should receive particular attention. If discharge is accompanied by bleeding, an unpleasant odor, pain, or suspected leakage of amniotic fluid, medical attention should be sought promptly. The cause of vaginal discharge cannot be determined solely by its appearance. For an accurate diagnosis, an obstetrics and gynecology specialist may perform an examination and, when necessary, laboratory tests. Early evaluation can help ensure that appropriate treatment is initiated in a timely manner.