Hyperprolactinemia unrelated to pregnancy occurs in approximately 0.1 to 0.3% of the general population and may result in infertility, hypogonadism, and galactorrhea. Such nonphysiologic hyperprolactinemia is caused mainly by drugs or by tumors in the anterior pituitary gland, primarily prolactinomas (see 102200). However, 10 to 60% of patients with hyperprolactinemia who undergo MRI have normal findings (summary by Newey et al., 2013).
Patients with hyperprolactinemia may also experience agalactia (Kobayashi et al., 2018). [from
OMIM]