Kidney-Yin deficiency is characterized by a red tongue with little or no coating, and can usually be treated with medications such as Zuo Gui Wan. In Kidney-Yin deficiency, Yin and fluids do not reach the tongue in time, and the tongue will be red with little or no moss. At the same time, kidney yin deficiency may also lead to spermatorrhea and enuresis, heat in the heart (heat in the heart of the hands and feet, and self-consciousness of heat in the heart and chest), premature ejaculation, lumbar and knee soreness (feeling of soreness and weakness in the lumbar area and knees), hot flashes (bursts of fever), and night sweating (sweating abnormally after falling asleep, but stopping when waking up), and other symptoms. Kidney yin is suitable for treatment with Zuo Gui Wan, which can nourish kidney yin. Adverse reactions and contraindications have not been clarified. During the period of taking the drug, ensure proper rest and a balanced diet. The use of drugs need to be under the guidance of a physician, if you are not feeling well, it is recommended to go to the hospital in time, do not delay the condition.