A medical condition in which males develop enlarged breast tissue, often due to hormone imbalances or certain medications.
From Greek 'gyne' (woman) + 'mastos' (breast) + '-ism' (condition or state). The term emerged in medical literature in the 19th century to describe this feminization of male breast tissue.
Gynecomastia affects up to 70% of adolescent boys temporarily due to normal hormone fluctuations during puberty—it's so common that doctors have a specific term for it, yet many teens don't realize it's usually temporary and treatable.
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