Hair baldness, also known as seborrheic alopecia, may be caused by the following factors: 1. Genetic factors: mainly manifested by the family history of some patients. 2. androgen secretion: after puberty, some patients have increased androgen secretion, androgen reaches the site of the hair follicle through blood circulation and is converted into toxic substances to stimulate the hair follicle, causing the protein metabolism of the hair follicle to become impaired, resulting in hair loss. 3, Oily skin: excessive oil secretion after puberty, excessive oil accumulation around the hair follicle, which affects the hair follicle and causes hair loss. 4. other factors, such as frequent late nights, alcoholism, sun exposure, frequent consumption of spicy food, etc.