You might not have any symptoms from a prolactinoma. But in some men and women, their breasts may produce milk.

In women, an increase in prolactin can lower the level of estrogen. That can cause infertility, menstrual changes, and less desire to have sex.

In men, it can lower the level of testosterone. That can cause erection problems and less desire to have sex.

The tumor may cause a headache. And sometimes the tumor presses on the optic nerves, which are near the pituitary gland. This might cause vision problems.