What causes male breast tissue enlargement?

See a doctor: Male breast enlargement is called gynecomastia and can be common in men. It is seen at puberty but can also be seen in grown men who are overweight (the man boob) or due to medications. Male breast cancer usually occurs on 1 side and is firm. I recommend getting evaluated by your family doctor who can refer you to a surgeon for complete evaluation.

Medication, Hormones: Male breast enlargement (gynecomastia) is relatively common and can be caused by various medications, such as antacid or blood pressure medications. Many cases are due to the normal hormonal changes that occur in men. Liver disease, marijuana smoking and testicular tumors that secrete hormones can also be a factor. Because men can get breast cancer, see a specialist if you notice any changes.