I'm often referred women with nipple discharge that isn't galactorrhea. The problem is usually unilateral, but sometimes bilateral, and is most often due to a benign inflammation of the ducts. These women have normal prolactin levels, but it's a good idea to get a breast specialist to evaluate them to rule out the small possibility of an occult ductal carcinoma. There are actually many women who have normoprolactinemic galactorrhea; a trial of low-dose bromocriptine may help if the galactorrhea is problematic.