There are more reasons for gray hair, such as older hair graying, or suffering from certain diseases that cause gray hair, or stay up late, mental stress, etc. can cause the generation of gray hair, need to be handled differently. A common cause 1, physiological factors: such as gray hair in old age is due to progressive loss of tyrosinase activity in melanocytes and the disappearance of hair stem melanin; 2, genetic factors: such as progeria, albinism, Werner syndrome, Waardenburg syndrome, Book syndrome, etc. can cause gray hair; 3, disease factors: such as vitiligo, baldness and other skin diseases, or pernicious anemia, tuberculosis, typhoid and other chronic wasting diseases can cause the body to lack of nutrition causing gray hair. Endocrine diseases such as hyperthyroidism and pituitary lesions can affect the pigment cells ability to cause gray hair; 4, mental factors: regular late nights, mental stress or severe mood swings, such as excessive worry, fear, sadness, etc. can also make the hair gray; 5, other: B vitamins and other nutrient deficiencies, X-rays and radionuclide irradiation can also cause hair graying situation. Second, the treatment method 1, if the physiological factors or genetic factors caused by gray hair, generally can not be alleviated, can be dyed to change the hair color; 2, if the disease caused by gray hair, you need to follow medical advice to actively treat the primary disease, in some cases, gray hair can be improved; 3, if the mental factors caused by gray hair, it is recommended that patients through the adjustment of the mindset for relief, if necessary, you can seek psychological guidance . In general, after removing the undesirable factors, the hair can gradually recover its original appearance. Patients should eat foods rich in vitamins and proteins in their daily life, work and rest regularly, and get enough sleep. You can also massage the scalp and use hair care products appropriately.