The causes of long gray hair are genetic factors, psychosomatic diseases, consumptive diseases, endocrine disorders, and abnormalities of trace elements in the body. 1. Genetic factors: hereditary gray hair is rare, at birth, early gray hair is often familial. 2. Mental illnesses: such as long-term worry, emotional tension, anxiety, depression, etc. may contribute to the gray hair. 3. Consumptive diseases: such as tuberculosis, malaria, etc. can also promote hair gray. 4. Endocrine disorders: such as lower pituitary function, thyroid disorders, etc. are sometimes associated with gray hair. 5. Abnormalities of trace elements in the body: teenage hair whitening is related to changes in the content of copper and zinc ions in the hair. Gray hair patients should go to the hospital in time, under the guidance of the doctor standardized treatment.