Gray hair on forehead may be caused by genetic factors, mental factors or malnutrition, and may also be suffering from vitiligo. 1. Hereditary factors: some people have a lot of gray hair on the forehead is usually related to genetic factors, this situation usually in adolescence will begin to appear. 2. mental factors: some people due to the usual mental stress, emotional tension and anxiety, it is easy on the follicle melanocyte function, making the melanin production decreased, which led to the forehead part of the white hair. 3. malnutrition: if usually often partial food or picky or the existence of gastrointestinal diseases, make the body malnutrition, lack of vitamins and copper, iron, zinc and other essential trace elements of melanin synthesis, may also make the frontal head of the white hair increase. 4. vitiligo: the disease is a skin melanocyte destruction, resulting in melanin deficiency disease, the cause of the disease is not clear, often manifested as skin pigmentation patches of varying shapes and forms, if the occurrence in the forehead, can appear forehead white hair phenomenon. In addition, older people may also have gray hair on the forehead, which is usually due to the gradual decline in the function of skin melanocytes with age, is a normal physiological phenomenon. Frontal gray hair patients exclude physiological factors, it is recommended to go to the regular hospital for examination, to find out the specific causes, under the guidance of the doctor to use the appropriate treatment plan, usually must ensure sufficient sleep, do not stay up all night, but also pay attention to regulating the mentality, to maintain a relaxed mood.