Kidney essence deficiency refers to a disease in which the kidney essence is empty and cannot nourish the brain marrow. The essence stored in the kidney is the basis of the body's life activities. The main function of kidney essence is to control the growth and reproduction of the body, and it is the basic substance of life activities. The spirit can regulate the essence of the internal organs to meet their activity needs; it can produce marrow, nourish bones, nourish the brain, and participate in the production of blood to improve the body's antibody capacity. Most of the formation of kidney essence deficiency is due to old age, kidney essence loss, or congenital deficiency, or due to long-term illness and loss of postnatal nourishment. In fact, the pathological manifestations may affect their growth and development in infancy; in youth, it may lead to premature aging, sexual dysfunction, and see diarrhea, impotence, etc. Kidney essence deficiency usually manifests as dizziness and tinnitus, soreness of waist and knees, sexual dysfunction, less sperm in men, premature exhaustion of "Tiankui" in women, premature aging, fatigue and forgetfulness, pale tongue with less fur, deep and thin pulse, and other symptoms.