Washing hair accompanied by hair loss, to consider is a variety of circumstances caused to, first, to consider is the shampoo factor, some substandard shampoo contains katsu, nipagin ester, sulfate table live and other stimulating ingredients, and such ingredients can lead to hair loss. Secondly, to consider is physiological hair loss, normal people within 1 day to lose 100 hair is a normal phenomenon, at this time, the loss of hair is mostly resting hair loss, belongs to the normal phenomenon. In addition, we should also consider certain pathological factors caused by hair loss, such as androgenetic alopecia, the cause of its pathogenesis and hormone levels, as well as the hair follicle androgen receptor polymorphism, such as nutritional metabolic alopecia, may be related to poor nutrition of the body; such as physical hair, may be related to special hairstyles, excessive pulling and radioactive damage; such as infectious alopecia, may be related to fungal infection, syphilis spirochete infection related.