These benign tumors are also
common. They make too much prolactin. If you are a woman, high prolactin levels can
make your menstrual period irregular, or even stop your period. These tumors can also
cause you to make breastmilk, even if you are not pregnant or nursing. If you are a
man, you may have erectile dysfunction or a lack of interest in sex. You may also
have enlarged breasts, a low sperm count, or less body hair. In time, you may have
headaches and vision problems.