Sudden increase of gray hair can be caused by a variety of factors, which can be seen in ageing and other physiological factors, but also can be seen in emotional disorders, kidney essence deficiency and other pathological factors. 1. Ageing: When the physical age gradually grows, life psychological pressure increases, may lead to a sudden increase in gray hair. 2. Emotional disorders: Chinese medicine theory believes that hair is the rest of the blood. If the temperament is impatient and easy to move, resulting in liver fire inflammation, liver and blood dryness, resulting in blood heat congestion, hair roots lose moistening, which leads to a sudden increase in gray hair. 3. Insufficient kidney essence: Chinese medicine theory that the kidney its Hua in the hair, that is, sufficient kidney qi, qi and blood smooth hair thick and moisturizing. When the liver and kidney deficiency (liver and kidney function weakness), the essence and blood insufficiency, resulting in qi and blood can not glorify in the head and face and lead to a sudden increase in gray hair. If you exclude physiological factors of sudden increase in gray hair, you should go to the hospital in time for relevant examinations to clarify the cause of the disease and actively cooperate with the doctor’s treatment.