Hair loss in girls may be normal physiological metabolism, but also closely related to possible personal genetic factors, mental factors, etc. Of course, some disease factors cannot be ruled out. 1, metabolism: hair loss in girls may be normal physiological metabolism, almost everyone will lose hair every day, but also in hair growth, the overall number of hair to maintain a dynamic balance. If there is no significant reduction in hair volume and no other abnormalities in the body, there is generally no need for special treatment; 2, genetic factors: girls due to genetic factors, greasy scalp, sebum secretion may lead to more hair loss, in this case there is generally no causal treatment, should often wash the hair, maintain scalp hygiene, reduce hair loss; 3, mental factors: tension, anxiety, poor sleep, etc., can cause girls endocrine functional Disorders, various micronutrient deficiencies, hair follicle growth restriction, hair loss phenomenon. Daily life should maintain emotional stability, eat more fresh vegetables and fruits, can improve the symptoms; 4, disease factors: disease factors such as pernicious anemia, hyperglycemia, abnormal thyroid function, abnormal liver and kidney function, connective tissue disease, etc. may affect the physiological function of the hair follicle because of endocrine disorders, nutritional disorders, which can lead to hair loss, when the hair volume can be significantly reduced, and accompanied by physical abnormalities. It is necessary to promptly seek medical examination to clarify the cause and then carry out appropriate treatment.