Hair loss is most commonly caused by malnutrition, androgen secretion, skin diseases, etc., and should be targeted for different causes of treatment. 1. Malnutrition: If you eat a small amount of food, meat and vegetables are not reasonable, nutritional intake is small, can cause hair loss, need to adjust the diet structure, supplemental nutrition. 2. Androgen secretion: when the human body androgen level is too high, will cause hair thinning, thinning, hair follicle miniaturization, thus causing hair loss, can follow the doctor’s instructions to use topical drugs such as minoxidil treatment. 3. Skin diseases: when there is folliculitis, seborrheic dermatitis, will cause the hair follicles are blocked, degeneration, atrophy, resulting in severe local hair loss, so you need to be in the dermatologist under the guidance of medication, such as selenium disulfide lotion, metronidazole gel and so on. Frequent hair loss of the crowd should eat a light and nutritious diet, to avoid late night labor, it is recommended to timely to the hospital, clear cause of the disease in the doctor’s guidance under the reasonable use of drugs.