The common causes of white hair on the head include age factors, genetic factors, neuropsychiatric factors, vitiligo, pernicious anemia and so on. 1. age factor: generally with the growth of age, the body’s various tissues and organs of the function of the gradual aging, the body of tyrosinase activity is also reduced, the generation of melanin is reduced, the phenomenon of hair on the phenomenon of white hair, and white hair will be more and more. 2. Genetic factors: some patients suffer from hereditary diseases, such as albinism, the body of tyrosinase deficiency or hypothyroidism caused by a lack of melanin in the skin and accessory organs or hereditary leukoplakia caused by impaired synthesis, there will be white hair, white skin phenomenon. 3. Neuropsychiatric factors:Long-term or too excited, too much pressure, mental tension, depression and other adverse neuropsychiatric factors, there may be the phenomenon of hair long white hair. 4. Vitiligo: patients with vitiligo, not only for the skin and mucous membranes have white spots, will also appear on the head of the symptoms of long white hair. 5. pernicious anemia: this disease is mainly due to gastric mucosal atrophy, the lack of internal factors, resulting in vitamin B12 absorption obstacles caused by fatigue, dizziness, palpitations, shortness of breath and other symptoms of anemia, may also appear to have the phenomenon of hair long white hair. It is recommended that patients according to their own situation, if necessary, go to the regular hospital, follow the doctor’s instructions to clarify the diagnosis, timely treatment.