WHAT IS GYNECOMASTIA? Gynecomastia in men is the enlargement of the glandular breast tissue in the male breasts. During childhood, puberty, and in middle-aged to older men, it can be common and lead to psychological and emotional problems. True gynecomastia results from the growth of glandular or breast tissue, which is present in very small amounts in men. Although gynecomastia in men is not a...