Thinning hair at 14 years old is considered to be ringworm of the head, androgenetic alopecia, baldness, etc. It can be treated with topical medication, oral medication, and in severe cases, hair transplantation. 1. Tinea capitis: Tinea capitis is a fungal infection, and some types of tinea capitis can cause hair to become dry, lusterless, thinning, brittle, and easy to break, mainly oral antifungal medication, such as ashwagandha, terbinafine, itraconazole, and so on. 2. Androgenetic alopecia: androgenetic alopecia is a kind of hair loss caused by heredity, which is mainly manifested as thinning, thinning and gradual loss of hair, and it can be relieved by oral medication, such as finasteride for men, spironolactone for women, and minoxidil for hair growth. If conditions allow, you can have a hair transplant. 3. Patchy baldness: Patchy baldness is a sudden patchy hair loss caused by mental stress, etc. You can inject dexamethasone, betamethasone and other medications, and you can also apply minoxidil locally. There may be other reasons for the thinning of hair at the age of 14, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment. All of the above drugs should be used in accordance with medical advice.