The phenomenon of teenage hair thinning may be caused by congenital factors or acquired factors, such as seborrheic alopecia, certain internal diseases, etc. Different treatment measures should be taken according to different causes. 1. Congenital factors: due to genetic factors, such as parents with thinning hair, their children may have thinning hair when they are teenagers. Usually, no special treatment is needed, but if it affects the aesthetics, it can be solved by hair transplantation and other ways. 2. Acquired factors: (1) Overflow alopecia: also known as androgenetic alopecia, may be related to heredity, androgen and other factors, making the hair follicles atrophy and disappear, hair loss, so there may be the phenomenon of teenage hair thinning. Patients can follow the doctor’s instructions to use topical drugs such as minoxidil, oral anti-androgen drugs, such as oral small doses of finasteride for male patients, oral spironolactone for female patients, etc., the use of drugs need to be carried out under the guidance of a doctor, do not self-medication. (2) some internal diseases: common such as hypothyroidism, systemic lupus erythematosus, etc., can appear thinning hair, or even hair loss and other phenomena, it is recommended that patients go to the regular hospital in a timely manner to consult a doctor for a definitive diagnosis in the doctor’s guidance under standardized treatment. In addition, if the adolescent severe malnutrition or serious digestive and absorption disorders, can also make the hair follicle underdevelopment, the phenomenon of hair thinning, which can be properly supplemented with nutrients to improve the symptoms. Teenage hair thinning, if ruled out congenital factors, parents are advised to bring the patient to the regular hospital in a timely manner, after a clear diagnosis, according to the different causes of different measures, do not use drugs, so as not to cause serious adverse effects.