High prolactin level since 2000. mri's does not show tumor in pit gland. no period in a year. breast discharges milky color. mammogram was normal. ?

High Prolactin: Aside from a pituitary tumor, high prolactin levels can be caused by breast feeding, hypothyroidism and certain medications. Any medication that restricts the effect of the brain chemical Dopamine can cause abnormalities in prolactin production. This is because Dopamine regulates prolactin production by the pituitary gland. These medications include some drugs for high blood pressure.

Med or small tumor: Very small pituitary tumors may not be visible on mri, but they do tend to eventually enlarge and show up, particularly in 13 years. High prolactin can also be due to low thyroid and many medications, particularly medications for psychosis, depression, anxiety and the like. Some women just have high prolactin, without known cause. Cabergoline can be very helpful. Ask your doctor.