The causes of gray hair in teenagers include congenital insufficiency of endowment (poor congenital constitution and functioning), strain and injury to blood, and insufficiency of the liver and kidneys (weakness of the liver and kidneys). 1. Insufficient endowment: Teenagers with gray hair may be due to the presence of family factors, resulting in congenital insufficient endowment, which is not a pathological condition. 2. Exhaustion and injury to blood: Teenagers with gray hair, such as with insomnia, forgetfulness, palpitations and anxiety (heartbeat, panic), fatigue, etc., mostly due to excessive thinking and exertion, so that the heart and blood depletion, hair loss of nourishment led to. 3. Liver and kidney insufficiency: Gray hair in teenagers, such as with hair loss, lumbago, infertility, mental fatigue, etc., may be due to liver and kidney deficiency, yin and blood insufficiency, hair loss of moistening and nourishing caused by. If you need treatment, please go to a regular hospital in time, follow the doctor’s instructions for medication, do not self-medication.