Hair thinning can be caused by malnutrition, seborrheic alopecia, baldness, etc., you can increase nutritional intake, medication and other ways to increase hair growth. 1. Malnutrition: If there is malnutrition, the phenomenon of thinning hair can occur, usually can increase the intake of nutrients, you can eat more meat, eggs and milk. 2. Seborrheic alopecia: Seborrheic alopecia is generally associated with excessive secretion of androgens, which can be treated with topical medications such as minoxidil, finasteride for men and spironolactone for women. 3. Patchy baldness: Patchy baldness is usually caused by mental stress, heredity, etc. It can be treated with glucocorticosteroids such as dexamethasone ointment. If you have too much hair thinning, go to the hospital in time for examination, and use the above drugs should follow the doctor’s instructions.