The causes of hair loss are roughly the following: 1. Endocrine disorders. Relevant experts point out that hair loss is related to the increase of androgens in the human body. Other scholars have found that there are many patients suffering from thyroid disease combined with hair loss, thus arguing that hair loss is related to thyroxine. 2, mental and nervous disorders. Some young people suffer heavy blows, or long-term mental tension, depression and produce hair loss. 3.Heredity. Alopecia areata patients with family history accounted for 20%. In heredity, it is dominant for men and recessive for women, which is one of the reasons why there are more men than women with hair loss. 4. Immune dysfunction. Clinically, it is found that people with immune system disorders such as lupus erythematosus and ulcerative colitis are often accompanied by hair loss. 5, lesion infection. Infections caused by fungi, bacteria and viruses can lead to thrombosis or small vasculitis in local blood vessels, and the hair in its dominant range can produce hair loss due to impaired blood supply. 6, improper diet and fat metabolism disorders. Some young men excessively like meat and alcohol, when the body produces a lot of cholesterol can make too much sebum, thus affecting the blood supply of hair follicles. Impede the normal growth of hair and cause hair loss. 7, blood deficiency and kidney deficiency. Chinese medicine believes that hair loss is the result of blood deficiency and kidney deficiency. 8, hair damage. Foreign experts have pointed out after investigation, long-term use of hair dyes, hair loss can occur in 2 to 20 years. In addition, the frequent use of hair dryers, fire pliers, electric heaters perm, can also cause hair loss. At present, there is no special medicine for hair loss. In order to prevent hair loss, you must pay attention to the following points: 1.Find the cause of hair loss in time. 2.Pay attention to nutrition, eat more vegetables and fruits, and eat less stimulating food. 3, take vitamin B1, B2, B6, injections of B12. for severe hair loss can be under the guidance of doctors, hormonal drugs. 4.Topical medication, such as hair growth water, hair loss regenerator, etc. 5.Treatment methods such as facial massage, ultraviolet radiation, plummer’s needle and laser ear acupuncture are used. 6.Strengthen physical exercise, and also take Bajhen pill and Shou Wu tablet to nourish the stomach and blood.