During daily consultations, some patients are particularly concerned about whether their breasts are considered to be abnormally developed or not. Is their condition considered serious? In fact, when you are anxious, you may want to analyze and judge your condition scientifically against the criteria. First, how big is the male breast gland considered to be abnormally developed? When you find that the gland is greater than five millimeters through breast CT or ultrasound, you can determine the abnormal development of the male breast (mastopexy). Most of them are benign and there is no need to worry. Second, is the condition considered serious? There are two criteria for determining whether it is serious or not: 1. The appearance of female-type breasts is so obvious that it is unacceptable to the self. The psychological pressure and obstacle is very high. 2, abnormal symptoms in the chest (obvious lumps, nipple overflow, pain, etc.) suspected malignant tumor. So how to deal with male breast development abnormalities if they occur? 1.Simple observation: For physiological mammary gland development in adolescence, simple observation can be done temporarily, if it lasts for more than six months without remission, medical treatment can be considered, and surgery can be considered for more than one year without remission. 2.Treatment of underlying diseases: For cirrhosis/gonadal dysgenesis and other treatment of the original disease, mammary gland development can be spontaneously relieved. 3.Discontinuation of drugs that cause breast development: For drug-based breast development, most of them can be relieved by discontinuation of drugs. 4.Medical treatment: Tamoxifen can be used for those with no effect by simple observation 5.Surgical treatment: For adult male breast development, surgery can be considered for those who cannot be relieved by observation for more than 1 year, those with lumps, pain and discomfort, those with image quality of life, those with psychological stress affecting appearance and other patients who request surgery.