White hair on both sides is caused by the diminished function or reduced number of melanocytes in the hair follicles, which cannot synthesize enough melanin. This situation may be caused by normal aging, but also may be caused by mental factors, malnutrition and other aspects of the problem. 1, normal aging: with the increase in age, the melanocytes of the hair follicles with age gradually decline in function, the number decreases, and thus the hair will become white, usually the first two sideburns appear white hair; 2, mental factors: long-term fatigue, mental tension, stress will make the hair follicles The function of melanocytes decreases, leading to graying of the hair on both sides. Should pay attention to moderate relaxation, keep a happy mood, develop regular work and rest, and develop good habits; 3, malnutrition: lack of protein, vitamins, trace elements, especially the lack of copper, zinc and other trace elements closely related to melanin synthesis, easily lead to gray hair on both sides, you can eat more vegetables and grains; 4, other: due to chronic wasting diseases, endocrine disorders, excessive brain, genetic or drug factors, can also affect the hair growth, hair follicle nutrition and blood supply, thus leading to hair on both sides of the white, should actively treat the original disease.