Excessive breast development in boys can be treated through observation and follow-up, weight loss, medication and surgery. 1. Observation and follow-up: If it is physiological breast development, such as in the newborn period and puberty. If there are no uncomfortable symptoms, there is no need for treatment and observation is sufficient. 2. Weight loss: Obese patients have excessive fat in their body and hypertrophy will occur everywhere, and the mammary glands are no exception. After this kind of patients lose weight, the mammary glands will also become smaller. 3. Drug treatment: some diseases such as chronic cirrhosis, chronic kidney disease, hyperthyroidism and other diseases caused by elevated levels of prolactin, which can cause excessive development of the mammary glands, the patient needs to actively treat the primary disease, such as cirrhosis of the liver in advanced stages of the patient can choose liver transplantation and other treatment methods, chronic kidney disease patients can choose dialysis and other methods, hyperthyroidism can be selected for surgical treatment in order to improve the symptoms of the mammary glands. 4. Surgery: If the symptoms of overgrowth of mammary glands cannot be improved by medication, it can be treated by surgery such as liposuction and gland removal. It is recommended that patients go to regular hospitals to find out the cause of the disease and receive treatment according to the doctor’s instructions.