Gray hair may be due to kidney deficiency, but it is also related to aging and deficiency of qi and blood. Treatment should be based on nourishing the liver and kidneys, benefiting qi and nourishing blood (replenishing the body’s qi and blood). 1. Physiological factors: Common physiological factors that lead to gray hair are aging, prolonged late nights, irregular work and rest, and high work pressure. 2. Deficiency of qi and blood: deficiency of qi and blood causes the body’s qi and blood to be insufficient to glorify the head and eyes, so the hair is not nourished and gray hair. 3. Kidney deficiency: Kidney hides essence, and essence produces blood, which produces blood to nourish the hair. When there is kidney deficiency, there is not enough kidney essence to nourish the hair, thus causing the hair to turn gray. Gray hair may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.