The causes of gray hair may be congenital albinism, genetically related albinism, physiological albinism, nutritional albinism, disease-induced albinism, and so on. 1. Congenital gray hair: most patients already have some or all gray hair at birth, but there are also a few that occur after birth, manifested as autosomal recessive inheritance, such as albinism. 2. Heredity-related gray hair: also called young gray hair or less white head, usually appear before the age of 20, there are genetic reasons. 3. Physiological Gray Hair: Also called Gray Hair in Old Age, it is a symptom of physical aging, because the function of melanin cells declines, and the hair will gradually turn gray with age. Elderly gray hair grows gradually from the temples to the top of the head, and after many years, all the hair will be white, and even eyebrows, beard and nose hair will also become white. 4. Nutritional gray hair: refers to the lack of some nutrients needed by the body and caused by gray hair, long-term lack of protein, vitamin B, trace elements, etc., will make the hair from black to white. 5. Disease-induced gray hair: including autoimmune diseases, hyperthyroidism, metabolic diseases, etc., may cause the symptoms of gray hair. Excluding physiological, congenital gray hair, the patient should go to the hospital in time for examination, clear causes under the guidance of the doctor for symptomatic treatment.