Doctor's Notes on Gynecomastia
Although gynecomastia may be caused transiently in the normal development boys, it usually resolves on its own. Other causes such as medical conditions or medical treatments may not resolve spontaneously. Causes associated with gynecomastia development include cirrhosis, malnutrition, chronic kidney failure, disorders of the male sex organs, aging, testicular cancer, hyperthyroidism and anti-androgen medical treatments. Other associated causes are alcohol use and some drugs of abuse like heroin.
Male breast cancer usually causes gynecomastia only on one breast and may include a lump or feeling of hard tissue in the breast; other signs and symptoms may be breast skin changes, nipple discharge and enlargement of underarm lymph nodes.
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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.