Clinical manifestations: The clinical manifestations of kidney yin deficiency include dizziness and tinnitus, soreness of the waist and knees, insomnia and dreaminess, hot flashes and night sweats, irritability of the five hearts, dry throat and red cheekbones, red tongue with little fluid, thin pulse, seminal emission in men and menorrhagia or menorrhagia in women. The deficiency of Yin is due to hyperactivity of Yin and Yang, and deficiency of heat to compel the Blood; the wasting of the body, dry throat and red cheeks are due to deficiency of Kidney-Yin; the hot flashes and night sweats, irritability of the five hearts, yellow urine and dry stool are all internal deficiency of heat; the red tongue with little fluid and the thin pulse are all evidence of Yin deficiency. The main point of identification and treatment: Kidney Yin deficiency is the deficiency of Kidney Yin and deficiency heat. 1. Symptoms: Kidney collects essence, bones and marrow, waist is the house of kidney, kidney yin deficiency results in lumbar pain and weakness; dizziness and tinnitus; hot flashes and night sweats, five heartburn, dry throat and red cheeks, red tongue with little fluid, weak pulse; low menstrual flow and menorrhagia. 2. Treatment: Nourishing kidney yin. Main formula: Liu Wei Di Huang Wan, Zhi Bai Di Huang Wan, etc. Prescriptions: Radix Rehmanniae, Dampi, Zegna, Poria, Cornu Cervi Pantotrichum, Huai Shan, Shu Di, Zhi Mu, Huang Bai, Radix et Rhizoma Polygonati, Dry Lotus Grass, etc. Regarding the treatment of kidney yin deficiency, it is also important to pay attention to the problem of the opposing mutual roots of yin and yang. What is commonly referred to as kidney deficiency includes kidney yin deficiency and kidney yang deficiency and yin and yang deficiency. Kidney yin deficiency belongs to the depletion of substances, while kidney yang and kidney qi are functional. If the consumed substance (kidney yin and kidney essence) is more, such as too frequent sex, or due to excessive labor (including mental and physical strength), or born weak, its material base is damaged or the vegetative body is more lacking, and the symptoms of kidney yin deficiency easily appear, such as soreness of the waist and knees, weakness of the limbs, dizziness and tinnitus, hair loss, loose teeth, memory loss, premature aging, decreased libido, seminal emission, premature ejaculation, etc. Kidney yin deficiency is also prone to deficiency heat, yin deficiency yin does not control yang is generated by internal heat, so it is easy to appear five heart trouble heat, night sweating. Generally, kidney yin deficiency occurs in young and middle-aged people, because young and middle-aged people are more active, whether studying, exercising, more energy material depletion. Kidney Yin deficiency in sexual function is manifested by not low libido, but rapid ejaculation (premature ejaculation), accompanied by seminal emission. The kidney yang deficiency is more impotent, and there is fear of cold, cold hands and feet, clear and long urine, and loose stools, and is mostly seen in the middle-aged and elderly population. The common symptoms of kidney yin deficiency and kidney yang deficiency are lumbar weakness, limb weakness, etc.