Hair with gray hair may be a normal physiological phenomenon or disease causes, disease gray hair is mainly on the cause of treatment, according to the specific causes to choose the appropriate treatment method. 1. Normal physiological phenomenon: If the elderly have gray hair, it is considered a normal physiological phenomenon, which is mainly due to ageing, the melanin-producing cells in the body will be reduced, which is a normal physiological phenomenon, generally do not need special treatment. 2. Disease causes: If you are a teenager with gray hair, mainly according to the cause of the treatment, if there is hyperthyroidism, you can use formamide imidazole and propylthioxythiophene treatment. If there is anemia, you should use vitamin B12, folic acid and other corrective anemia, in addition to pay attention to avoid too much mental stress. There may also be accompanied by vitiligo white hair, according to the condition of oral hormone such as prednisone or topical carbotriol and other drugs, skin recoloration after white hair can be followed by improvement. There may also be other reasons for the hair to have white hair, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, follow the doctor’s instructions to give targeted treatment or treatment, do not self-medication.