Seborrheic alopecia is common, and its causes include genetic factors, abnormal androgen metabolism, dietary factors and other factors. 1. Genetic factors: seborrheic alopecia has a certain genetic tendency, according to the survey shows that male seborrheic alopecia patients, patients with family genetic history accounted for 53.3% ~ 63.9%, the paternal inheritance is significantly higher than the maternal inheritance. 2. Abnormal androgen levels: Androgens play an important role in the formation of this disease. Androgens can be metabolized to testosterone and 5α-dihydrotestosterone, prompting hair follicles to miniaturize, and hair in the anagen phase can gradually become finer and shorter, leading to the phenomenon of hair loss. 3. Dietary factors: Eating high-sugar, high-fat or spicy stimulating food, prompting sebaceous glands to secrete exuberantly, leading to the accumulation of scalp oil, hair follicle clogging, which in turn causes hair loss. 4. Other factors: mental tension, excessive pressure, staying up late for a long time, or not paying attention to scalp cleansing can also cause damage to the hair follicles, resulting in hair loss. When you find that your hair becomes abnormally greasy and hair loss is serious, you need to go to the hospital in time and under the guidance of the doctor for reasonable treatment.