The appearance of gray hair in young people is mainly affected by genetic factors, mental factors and nutritional factors. 1. Genetic factors: some patients have gray hair because of the presence of family genes. If there is a genetic defect, the melanin cells in the hair follicle will usually age and die earlier, which may lead to the appearance of gray hair. 2. Mental factors: under the influence of current social factors, many patients suffer from long-term mental tension, anxiety and severe sleep deprivation, which can cause the normal function of follicular melanocytes to be impaired, resulting in gray hair. 3. Nutritional factors: If the patient’s diet is not balanced, the body does not have a variety of vitamins and trace elements needed by the human body, especially copper, iron, zinc and other elements of the lack of, which will affect the melanocyte synthesis of melanin, will lead to the emergence of gray hair. If the above conditions are excluded, patients can go to the hospital to find out the cause of the disease.