Hair loss is not always a disease. Since hair growth has its own cycle, as the growth cycle ends, the hair will shed on its own and be replaced by a new hair. Because each hair has a different growth cycle, even adjacent hairs are not in the same growth cycle, so normally, people lose hair every day, for example, dozens of hairs are shed every day. But the normal hair loss is scattered, and soon there will be new growth, shedding and growth in a dynamic balance, so it will not cause the reduction of hair or the formation of baldness. People do not have to worry about hair loss when combing and washing hair every day. In human life, 15-30 years old hair growth is the fastest, with the growth of age growth rate gradually slowed down, and with the aging of the skin shrinkage of the number of hair follicles gradually reduced, hair will gradually thin; some women after childbirth hair loss more, this is due to endocrine and nutritional reasons, after a period of self-regulation most can recover. These are normal physiological phenomena. If a person is in the prime of life and hair loss significantly increased, hair loss and new hair can not maintain a dynamic balance, hair thinning, this may be a pathological state, need to actively find the cause of the disease, the symptomatic treatment.