Gray hair at a young age may be related to environmental factors, vitiligo, drug-induced, hereditary diseases, albinism and other factors. 1. Environmental factors: if the patient is exposed to the sun for a long time, it may cause damage to the melanocytes of the hair follicles and gray hair will appear. 2. Vitiligo: If vitiligo grows on the head, white patches will appear on the skin, and the color of the hair on the white patches will be silver-white. 3. Drug-induced: If patients use tyrosinase inhibitors and other drugs for a long time, it may lead to abnormalities in the function of the enzyme lysinase, causing long white hair. 4. Hereditary diseases: If the patient has tuberous sclerosis, mottled disease, phenylketonuria and a series of genetic metabolic diseases, it will lead to long white hair. 6. Other factors: abnormal thyroid function, long-term mental stress, can lead to the early appearance of gray hair. It is recommended that patients consult a doctor in a timely manner to clarify the cause of the disease and strictly follow the doctor’s instructions for treatment.