Why does the top of your head lose hair?

The common causes of alopecia on the top of the head are seborrheic alopecia, alopecia areata and scalp skin damage. Seborrheic alopecia, also known as androgenic alopecia, is mainly caused by strong androgen secretion in the body. When estrogen secretion in the body is strong, estrogen directly acts on hair follicles, destroying hair follicles, thus causing hair loss. Women are mainly characterized by sparse hair on the top of their heads, while men are characterized by sparse hair on the top of their heads and obvious receding hairline. If there is a alopecia on the top of the head but the scalp is normal, this is called alopecia areata, which is mainly affected by immune factors, genetic factors, emotions, emergencies and other factors. If the skin on the top of the head is diseased, such as hair follicle damage caused by trauma, lichen planus on the top of the head, scleroderma, etc., the hair on the top of the head will fall off, and the cause of hair loss needs to be treated.