The relationship between androgens and hair loss is relatively close, and there is a clinical condition called androgenetic alopecia. Androgens play an important role in this disease, and androgenetic alopecia often has a clear family genetic predisposition in clinical practice. Therefore, androgenetic alopecia is a common clinical condition, but hair loss is not necessarily caused by androgen abnormalities, it can also be caused by many other diseases. For example, baldness can occur due to prolonged emotional depression and stress. Some patients may suffer from seborrheic dermatitis, which can lead to hair loss, or syphilis, which can lead to syphilitic alopecia. If the patient starts to develop the disease at puberty and is himself a male, and the hair can show a distinct m-shape after hair loss, it should be highly considered whether androgenetic alopecia occurs.