The most common disorder of hair loss in men is androgenetic alopecia, also known as seborrheic alopecia, commonly known as baldness. It is characterized by a receding hairline and progressive thinning and thinning of hair in the crown area. The reasons for this are as follows: 1. genetic factors: many patients have a family history of similar hair loss. 2. androgen levels: because the hair follicle is the target organ of androgens, androgens act on the hair follicle area, causing the hair follicle to shrink and become smaller, which in turn causes hair loss. 3. dietary factors: such as spicy, stimulating, fried, greasy food. Staying up late may also cause hair loss. Therefore, hair loss in men is the result of a variety of factors.