Why does hair always fall out when washing hair?

Hair loss may be caused by physiological factors or folliculitis, tinea capitis and other pathological factors.

First, physiological factors

into the autumn and winter season, the weather is usually dry, easy to lead to reduced sebaceous gland secretion of the scalp, hair loss may occur when

washing hair

the number of hair loss does not exceed 100 roots, generally belongs to the

.