The causes of gray hair in young people are very complex, but often it is either a congenital less gray head or an acquired less gray head. Some wasting diseases, such as tuberculosis, which is now more common, can also cause nutritional deficiencies and cause hair to turn white earlier than normal, and the hair of patients with chronic fever can also turn yellow, brittle or even white and fall out. Certain endocrine diseases, such as pituitary or thyroid diseases, can affect pigment cells and produce pigment granules, which can lead to premature graying of hair. Some neurological disorders can also make the hair gray, if excessive brain use, can also appear a large number of hair gray, and some young people in a short period of time excessive anxiety, sadness, severe trauma, or mental overwork, may also make the hair gray. As for the congenital brain sweeping so-called white hair, it is mainly related to heredity. Young people with long gray hair need to go to the hospital, under the professional guidance of a dermatologist to help find the cause, but they should pay attention to a healthy lifestyle, reasonable and balanced nutrition, moderate scientific exercise, quit smoking and limit alcohol, maintain a good sleep, psychological balance is very important.