Excessive secretion of breast milk.

AIP familial isolated pituitary adenoma (AIP-FIPA) is defined as the presence of an AIP germline pathogenic variant in an individual with a pituitary adenoma (regardless of family history). The most commonly occurring pituitary adenomas in this disorder are growth hormone-secreting adenomas (somatotropinoma), followed by prolactin-secreting adenomas (prolactinoma), growth hormone and prolactin co-secreting adenomas (somatomammotropinoma), and nonfunctioning pituitary adenomas (NFPA). Rarely TSH-secreting adenomas (thyrotropinomas) are observed. Clinical findings result from excess hormone secretion, lack of hormone secretion, and/or mass effects (e.g., headaches, visual field loss). Within the same family, pituitary adenomas can be of the same or different type. Age of onset in AIP-FIPA is usually in the second or third decade.

A rare genetic endocrine disorder characterized by persistently high prolactin serum levels (not associated with gestation, puerperium, drug intake or pituitary tumor) in multiple affected family members. Clinically it manifests with signs usually observed in hyperprolactinemia, which are: secondary medroxyprogesterone acetate (MPA)-negative amenorrhea and galactorrhea in female patients, and hypogonadism and decreased testosterone level-driven sexual disfunction in male patients. Oligomenorrhea and primary infertility have also been reported in some female patients.