Suddenly long white hair may be due to physiological factors or pathological factors, such as vitiligo, pernicious anemia and other factors caused by the symptoms. 1. physiological factors: generally with the growth of age, will make the melanin cells in the hair to reduce, resulting in hair fading white, and then suddenly long white hair, at the same time, if often stay up late, mental stress, but also easy to accelerate the speed of the hair white, there will be a sudden change of hair. 2. Vitiligo: If the patient suffers from vitiligo, it may be mostly manifested as a large number of white patches on the skin and mucous membranes, and when the lesions invade the scalp, it will lead to white patches on the skin of the head, the symptom of hair suddenly turning white, and the problem is serious. 3. Pernicious anemia: usually patients with pernicious anemia, may be due to insufficient synthesis of melanin in the body’s pigment cells, prone to the phenomenon of sudden white hair, will also be accompanied by the appearance of fatigue, dizziness, palpitations and other manifestations of anemia. In addition, it is important to note that the sudden growth of white hair may be related to other factors, it is recommended to actively seek medical attention to clarify the cause of the disease and standardized treatment.