Young people long gray hair may be due to psychological factors, malnutrition, disease factors and so on. 1. Psychological factors: may be psychological stress, fatigue, stay up late and other reasons, the body produces stress response to the neuro-endocrine dysfunction, may cause hair tissue inside the melanocyte function is impaired, and can not be normal synthesis of melanin, thus long gray hair. 2. Malnutrition: If the body lacks vitamin B1, vitamin B2, protein and other nutrients for a long time, it will affect the synthesis of melanin, and the phenomenon of long gray hair. 3. Disease factors: such as cardiovascular disease, thyroid dysfunction, anemia and other diseases, the local immune status is abnormal, affecting the function of melanin cells, thus appearing the above phenomenon. In addition, there are many reasons why young people grow gray hair, it is recommended to go to the hospital in a timely manner, follow the doctor’s instructions for treatment, to avoid delaying the condition.