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Causes of Gynecomastia
What causes gynecomastia?
Gynecomastia may be caused by an imbalance of hormones in your body. It can happen from normal hormone changes during infancy, puberty, or as men age. Or it may be caused by a medical condition or taking certain medicines.
Newborns may have enlarged breasts when they are first born because they received hormones from their mother.
Preteen and teen boys may develop gynecomastia from rapid changes in their hormone levels during puberty.
Men can develop gynecomastia from age-related hormone changes if their testosterone level drops too low. Or it can be caused by a medical condition, like chronic liver disease. There are also medicines that can cause this, such as hormone therapy for prostate cancer and medicines used to treat high blood pressure or heart problems.
Taking steroids for bodybuilding can also cause gynecomastia. But sometimes it occurs for no known reason.