It is clinically believed that the cause of gray hair is not divided into left and right, whether the right side of the gray hair or left side of the gray hair, the reason is the same, may be related to long-term mental tension or nutritional deficiency, may also be the cause of family genetics, and does not exclude the age of the cause. 1, long-term mental tension: if often engaged in brain work or emotional irritability, overworked, may cause the metabolism of melanin in the body The phenomenon of black hair becoming white hair, sometimes more white hair on the right; 2, lack of nutrition: if the food is excessively single or inadequate nutritional intake, may lead to low immunity, especially the lack of B vitamins, prone to dry hair or yellowing, long-term this will also lead to white hair, sometimes more white hair on the right; 3, family genetic: if the family 3, family inheritance: if the phenomenon of teenage gray hair in the family, most will be inherited to their children, causing hair gray, may also lead to more gray hair on the right; 4, age: some people over 55 years of age will appear gray hair, may be more gray hair on the right than the left, is a normal physiological phenomenon. It is recommended that such people pay attention to nutritional supplements, eat more black sesame or black fungus and other foods, while maintaining a good mood, avoid staying up late, and develop a normal regular lifestyle habits.