First of all, it is necessary to clarify whether it is pathological alopecia. Some people are born with sparse hair, but they are in good health and do not need intervention. Some people have a lot of hair when they are born, but it may gradually decrease with age and childbirth. This is related to the decline in metabolic capacity and does not require treatment. If there is a lot of hair loss, more than 3 months per day 100 hair, or the hairline visible to the naked eye decreases, pathological hair loss should be considered. It is recommended to see a doctor after diagnosis. The most common is seborrheic alopecia. Generally, minoxidil, spironolactone and finasteride tablets for external use can be well controlled. Alopecia areata can also be recovered after local medication. Fungal alopecia, etc. It's complicated and requires oral antifungal drugs.