There are many reasons why a man’s breasts are swollen and painful, such as breast hyperplasia, mastitis, trauma, and so on. 1. Breast enlargement: Hormonal disorders in the body of a man can lead to breast tissue hyperplasia, which will show the phenomenon of breast swelling and pain in men, especially common in the group of people who have just entered puberty. 2. Mastitis: Inflammation of the mammary glands of men can also cause breast swelling and pain, due to the local inflammation caused by infection, redness, swelling, heat and pain and other inflammatory reactions. 3. Trauma: Breast swelling and pain in men may be caused by trauma, such as impact injury, which can lead to local soft tissue edema, bruising, accompanied by pain. At the same time, the development of breast cancer to a certain extent will lead to breast swelling and pain, in addition, taking certain drugs to inhibit the degradation of estrogen, can also lead to hormonal disorders caused by breast development, breast swelling and pain may be. Careful identification is needed. There are many reasons why men’s breasts are swollen and painful, and it is recommended to go to the hospital in time to improve the examination after the symptoms appear, and take standardized treatment according to the doctor’s instructions, so as not to ignore the symptoms and take them lightly.