It is normal to lose a lot of hair but the number of hairs lost is less than 100 per day. If the number of hair loss is more than 100 a day, consider that it is caused by diseases, such as androgenetic alopecia, baldness and so on. 1. Normal situation: every person will lose hair every day, tiredness, stress, will lead to hair loss of more roots. However, if you lose less than 100 hairs per day, it is normal. 2. Androgenetic alopecia: its causes are mostly related to the increase of androgens and hereditary factors; inflammation around hair follicles and bad living habits may also induce the disease, with clinical manifestations such as thinning, thinning and gradual loss of hair. 3. Patchy baldness: its cause is not yet clear, may be neuropsychiatric, autoimmune and hereditary factors, patients will appear patchy hair loss, mostly round or oval, different sizes, the number varies. The cause of hair loss is not unique, it is recommended that patients go to a regular hospital to clarify the cause of the disease.