Gray hair is now a relatively common hair disease in dermatology, causing gray hair for a number of reasons, the following common causes in clinical practice: 1, genetic factors. Young people with gray hair, most and family history of heredity is related, should carefully ask the patient’s family history, whether the patient’s parents have a history of gray hair. 2, mental stress. The young people are mentally stressed, life is stressful, often stay up late will lead to young people grow gray hair. 3, malnutrition. If the patient has malnutrition or nutritional disorders, resulting in the inability to properly absorb nutrients, especially the lack of trace elements and protein, there will be young people with gray hair. 4, liver and kidney deficiencies, Qi and blood stagnation. Chinese medicine says that some patients with liver and kidney deficiency will have withered hair and gray hair.