Chlamydia and gonorrhea can both cause a thick, milky discharge that is yellow or green. Additional symptoms can include bleeding between periods, pelvic pain, and urinary incontinence.

While prolactin rises during pregnancy to prepare for the unborn child’s nutrition, breast milk production in a woman who is neither pregnant nor breastfeeding is abnormal.

Vaginal discharge is a natural part of women's health. It is commonly seen in a large number of women. However, changes in ...

—Felix Chien, DO, Newport Beach, Calif. When galactorrhea occurs in a woman who is not postpartum or breastfeeding, the milky discharge is usually caused by elevated levels of prolactin.