The color of hair is related to the amount of pigment particles, and the pigment formation is related to the development and growth of pigment cells in the hair papilla. The functional situation of pigment cells determines the synthesis and secretion of pigment. In normal people, hair pigment cells start to decline from the age of 35. Some people have white hair earlier, in their 20s or even in their teens, which is medically known as juvenile gray hair, commonly known as “less white head”. There are many reasons why teenage white is caused, the common ones are: 1, malnutrition. Hair is an appendage of the skin, it is the same as other parts of the body organs, tissues, need adequate nutrition. According to medical clinical observation proved that if the body long-term lack of protein, vegetable oil, vitamin B1, vitamin B2, vitamin B6, and certain trace elements (such as copper, iron) will lead to hair from black to white. 2, psycho-neurological factors. Some young people in a short period of time, a large number of gray hair, and excessive anxiety, sadness and other psycho-neurological factors or excessive fatigue related. Bad mental factors can cause the blood vessels supplying hair nutrition to spasm, so that the pigment cells in the hair papillae and hair bulb secrete melanin, affecting the formation and delivery of melanin particles. 3, genetic factors. Teenage gray hair also has certain congenital factors, in the parents or family lineage have a similar occurrence. 4, suffering from chronic diseases. Some people suffering from vegetative dysfunction, hyperthyroidism, tuberculosis, typhoid fever, endocrine disorders, etc., can also develop gray hair. According to Chinese medicine, “the liver is the main blood collector, and hair is the residue of blood”, “the kidneys are the main essence collector, and its flower is in the hair”, “the heart is the main blood vessel”, “the lungs are the main skin and hair “The spleen is the source of Qi and blood biochemistry. In other words, the growth and color change of hair is closely related to the function of the internal organs, the warmth and moistening of Yang Qi and essence and blood. If the viscera function is strong, Yang Qi essence and blood is full, the hair is fully moistened black and beautiful. Young people are impatient, blood heat, blood and Yin; or worry, spleen loss of health, lack of sources of Qi and blood; or overwork, insomnia, liver and blood, etc., can hurt the organs, deficiency of Qi and blood, resulting in liver and kidney deficiency, hair loss and early white. Second, the prevention and control of the occurrence of juvenile white, in addition to genetics is a congenital factor can not be changed, other factors through reasonable regulation can be changed. First, maintain a positive and optimistic attitude toward life. Have a good mental state is a key factor in the prevention and treatment of juvenile white. Learn to regulate their emotions, relax more after school, work, and strengthen physical exercise, can play a role in preventing gray hair. Secondly, reasonable and healthy eating habits. In the diet should pay attention to the intake of iron and copper-containing foods. Foods containing more iron are animal liver, eggs, black fungus, kelp, soybeans, sesame paste, etc.; foods containing more copper are animal liver, kidney, shrimp and crab, nuts, etc. Attention should also be paid to the intake of vitamin B group, such as B1, B2, B6, rich in foods such as cereals, beans, dried fruits, animal liver, heart, kidney, milk, eggs and leafy vegetables. Gray hair is not irreversible, as long as the hair mother cells in the hair papillae exist normally and certain obstacles or pathogenic factors are removed, the hair can still turn black. Therefore, there is no need to worry too much about your gray hair, otherwise it may cause a vicious circle and only produce more gray hair.