Gynecomastia  男性乳房過度長大症       (In English and Chinese 中英文)

Edited by : Joe Hing Kwok Chu

Excessive development of the male breasts because of over development of mammary glands. Sometimes the function of female mammary glands can also appear. A common cause of gynecomastia is the increased ratio of estradiol and testosterone in older men. Temporary enlargement of the breasts is not unusual or abnormal in boys during adolescence or during recovery from malnutrition. Gynecomastia may be abnormal as, for example, in Klinefelter's syndrome.