Elevated levels of prolactin in the blood, which is a normal physiological reaction during lactation, but pathological otherwise; prolactin may also be elevated in cases of certain pituitary tumors, and amenorrhea is often present.

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hy·per·pro·lac·tin·emia or chiefly Brit hy·per·pro·lac·tin·ae·mia -prō-'lak-tə-'nē-mē-ə n the presence of an abnormally high concentration of prolactin in the blood
hy·per·pro·lac·tin·emic or chiefly Brit hy·per·pro·lac·tin·ae·mic -'nē-mik adj

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hy·per·pro·lac·tin·emia (hi″pər-pro-lak″tĭ-neґme-ə) increased levels of prolactin in the blood; in women it is associated with amenorrhea and galactorrhea, and in men it has been reported to cause hypogonadism, impotence, and in some cases gynecomastia. It is often associated with microadenoma of the adenohypophysis. hyperprolactinemic adj

Medical dictionary. 2011.

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