Male chest is usually mainly due to obesity or hormone levels in the body, once found need to seek medical treatment. Male chest enlargement is usually the performance of male mammary gland development disorder, the main reason is that the living conditions are superior, and usually do not pay attention to the reasonable diet and lead to the occurrence of obesity, which also causes the accumulation of fat in the mammary glands ultimately caused by the chest becomes large. Secondly, by the body’s hormone level is also one of the reasons why men’s chest becomes bigger, due to the male body’s estrogen level secretion is too high or the intake of drugs containing hormones too much, excessive estrogen will lead to the development of mammary glands, appearing to be larger than usual chest. At the same time, estrogenic drugs, or drugs that inhibit the degradation of estrogen, and special types of oncological diseases may cause excessive estrogen levels in the body and breast development. It is recommended that male patients with large breasts consult a regular hospital to clarify the cause and standardize the treatment under the guidance of the doctor.