It is normal to shed 70-100 hairs a day. Hair is an appendage of skin, consisting of hair shaft, hair root and hair follicle, and does not contain blood vessels and nerves. Hair is a long hair, with anagen phase of about 3 years, regression phase of about 3 weeks, and rest phase of about 3 months. There are about 100,000 hairs in an average person, 80% of which are in the anagen phase and 20% in the regression and resting phase, so a large number of hairs will be shed every day, while an equal amount of hairs will be regenerated to maintain a relative balance. If you lose more than 100 hairs per day, your hair will gradually become thinner.