The causes of gray forehead hair are various, physiological and pathological, and the pathological causes include skin diseases, endocrine diseases and hereditary diseases. 1. Physiological: ageing and natural aging will cause hair to turn gray, some people are the frontal area of the hair first gray, this is a normal physiological phenomenon, no additional treatment. 2. Pathological: If you suffer from skin diseases such as baldness and vitiligo, you will have follicular lesions that can cause frontal gray hair symptoms; there are also endocrine diseases such as hyperthyroidism and diabetes that can lead to endocrine abnormalities that result in pigment cell abnormalities, which can lead to symptoms; there are also hereditary diseases such as progeria and hereditary gray hair that can also lead to symptoms. If you suspect that the symptoms are pathologic, it is recommended that you seek prompt medical attention.