Gynecomastia

Etiology

Physiologic: neonatal, pubertal, aging, obesity
Endocrine: hyperprolactinemia, hyperthyroidism, Klinefelter syndrome, hypogonadism
Systemic disease: chronic liver or renal disease
Neoplasms: adrenal, testicular, lung, liver, breast
Drugs (selected): alcohol, amiodarone, anabolic steroids, cimetidine, diazepam, digoxin, estrogens, finasteride, flutamide, isoniazid (INH), ketoconazole, marijuana, omeprazole, opioids, progestins, protease inhibitors & antiretrovirals, spironolactone, testosterone, tricyclic antidepressants.

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