Leukorrhea refers to benign physiologic vaginal discharge. It is normal and not harmful.

Usually it is white, thin, milky, and odorless. The amount and quality of discharge can vary throughout the menstrual cycle. It often increases in volume during pregnancy. Other factors that can cause changes include a change in sexual partner or frequency, diet, certain medications, and taking hormones.

Leukorrhea is thought to be a product of estrogen's effects on the vagina.

It is most common in reproductive-age females but can be present postmenopausally. Leukorrhea may first present just prior to menarche as hormones begin to cycle. This can also be found in newborn females over the first few days of life due to estrogen withdrawal associated with birth.