The reasons for long gray hair on the top of the head are mainly the following: 1, the top of the head is the highest end of the body, young people have an irregular diet, often stay up late, work stress, long-term mental tension, will affect the blood and nutrient supply to the head, resulting in long gray hair on the top of the head, life and eating habits to restore normal, after a period of time gray hair can be reduced or disappear. 2, influenced by genetics, many people in young adults on the top of the head The first time you have to ask your family history, you will develop aggravation of your father’s generation also have this situation. 3, elderly people with gray hair on the top of the head is normal, due to into old age, melanin secretion in the hair follicles reduce hair roots in a state of decline formed. 4, patients suffering from hyperthyroidism, tuberculosis, plant nerve dysfunction, pituitary tumors will also appear.