Its etiology is very complicated. * * * * There are two kinds, one is congenital alopecia and the other is acquired alopecia. Many acquired baldness is accompanied by some diseases, and some are caused by mental stress and malnutrition. Chinese medicine believes that hair is closely related to vitality, vitality and qi. Only by maintaining a dynamic balance in the supply or function of the three can human skin and hair be normal and beautiful. If one gas is insufficient, it will affect the operation or function of other gases. If the second gas is damaged, it will inevitably lead to the damage of human skin and hair, lose its normal structure and properties, and show different degrees of morbidity. So, what is the cause of "juvenile white hair"? So far, there is no satisfactory exact answer in medicine. According to research, it may be related to the following factors. (1) Mental factors: If a person is depressed for a long time, in a bad mood or is highly nervous and overworked, his hair can turn from black to white. (2) Nutritional status: Hair is an appendage of the skin, and it needs adequate nutrition just like organs and tissues in other parts of the body. According to medical clinical observation, if the human body lacks protein, vegetable oil, vitamin B 1, vitamin B2 and vitamin B6 for a long time, it will also lead to the hair turning from black to white. (3) Diseases, drugs and heredity: Diseases, drugs and heredity are also factors that cause hair to turn from black to white. Endocrine disorders such as pituitary dysfunction and hyperthyroidism, consumptive diseases such as tuberculosis, typhoid fever and pernicious anemia, and autonomic nervous dysfunction are all diseases that have been found to be related to hair turning from black to white. The color of hair depends on the number, size and distribution of pigment particles in the hair cortex, as well as pigment properties and various optical effects. Whitening or whitening of hair in the elderly is a physiological phenomenon, which is related to the gradual loss of tyrosinase activity in hair balls. Traditional Chinese medicine believes that the occurrence of this disease is related to kidney deficiency and blood heat, and corresponding traditional Chinese medicine can be taken orally. It is recommended that patients go to the hospital to find a specialist for treatment. The most important thing to prevent juvenile white hair is to eliminate the objective factors that induce white hair. If you have a few white hairs, don't be too nervous; Don't be too tired and nervous; Broad-minded, optimistic, and keep a good mood; Pay attention to scientific catering, eat more coarse grains, miscellaneous grains, dried and fresh fruits and all kinds of vegetables, and don't be picky eaters and partial eclipse; Develop good habits of regular life, etc. White hair does not include white hair caused by natural aging in the elderly, but refers to early white hair diseases caused by genetic factors or certain diseases. Modern medicine believes that white hair is mainly caused by the reduction of melanin formation in hair, the weakening of melanin formation function of melanocytes and the decrease of tyrosinase activity. Any emotional stress, excessive brain use, anxiety, panic, nerve trauma, etc. It may cause white hair. In addition, when you are born with chronic wasting disease, white hair may also appear. Traditional Chinese medicine believes that the following factors are related to white hair: First, insufficient essence and blood: insufficient kidney essence can not produce yin blood, which leads to the loss of nourishment of hair, so it is gray. Second, excessive blood heat: emotional excitement, resulting in water without wood, excessive liver fire and blood dryness, excessive blood heat, hair roots dystrophy, so early white. Third, liver stagnation and spleen dampness: liver qi stagnation, sad spleen, spleen injury and dereliction of duty, blood and blood biochemical passive, so white hair.