What is gynaecomastia? - NHS - Gyno breast
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Gynecomastia (guy-nuh-koh-MAS-tee-uh) is an increase in the amount of breast gland tissue in boys or men, caused by an imbalance of the. Gynecomastia (also spelled Gynaecomastia) is an endocrine system disorder in which a noncancerous increase in the size of male breast tissue occurs.