Excessive development of the male mammary glands, even to the functional state; the development of abnormally large breasts in males. May occur in one or both breasts and begins as a small lump beneath the nipple, and the breasts often enlarge unevenly. Developing gynecomastia during puberty is common and usually recedes over a period of months. Gynecomastia can also be caused by chronic liver disease, exposure to anabolic steroids or estrogen, kidney failure, genetics, marijuana use, testosterone dificiency, or side effects from some medications. In rare instances an overactive thyroid, or genetic defects or tumors may be the cause.

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The Pituitary Patient Resource Guide Sixth Edition is now available! Be one of the first to have the most up-to-date information. The Pituitary Patient Resource Guide a one of a kind publication intended as an invaluable source of information not only for patients but also their families, physicians, and all health care providers. It contains information on symptoms, proper testing, how to get a diagnosis, and the treatment options that are available. It also includes Pituitary Network Association's patient resource listings for expert medical care.

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