Gray hair on both sides of the head may be a normal physiological phenomenon, but may also be related to heredity, disease, endocrine factors. 1. Physiological phenomenon: gray hair on both sides of the head is usually gray hair in old age, usually starting from the temples to become white, with the growth of age, it can gradually increase, and slowly to the top of the head, as a normal physiological phenomenon. 2. Genetic factors: hereditary gray hair is usually early gray hair, can occur in puberty, adolescence or adulthood, mainly by the influence of genes, such as progeria. 3. Disease factors: common disease factors such as vitiligo, is due to congenital pigment loss of skin and mucous membrane diseases, can be manifested as white spots or white hair. Other diseases such as baldness, pernicious anemia, tuberculosis, etc., can also appear on both sides of the head white hair performance. 4. Endocrine factors: long-term emotional stress, severe mood swings, lack of sleep, etc. can cause endocrine disorders, which can reduce the body’s melanin secretion, causing the phenomenon of gray hair on the top and sides of the head. In addition, the lack of nutrients, X-ray and radionuclide irradiation can also lead to the symptoms of gray hair on the top and sides of the head, you should consult a doctor in a timely manner to find out the cause of the disease, and if necessary, to carry out the appropriate treatment.