Gray hair at the back of the head may be caused by kidney deficiency, and may also be related to other causes such as genetic factors and nutritional factors. In Chinese medicine theory, it is believed that the kidney is the main bone marrow and its splendor is in the hair. If the kidney energy is sufficient, the hair will be black and shiny; if the kidney energy is insufficient, it can lead to an increase in gray hair. However, gray hair at the back of the head may also be caused by other reasons, such as genetic factors, there are direct relatives in the family premature gray hair, the chances of premature gray hair will also increase. In addition, gray hair on the back of the head and aging, lack of protein or vitamins, vitiligo and other reasons also have a certain relationship, need to be in the physician’s diagnostic guidance, to clarify the specific causes of the disease, before you can carry out symptomatic treatment.