In kidney yin and yang deficiency, the tongue may be fat, tender, pale in color, with less fluid, thin and thin, etc. It should be combined with other symptoms to diagnose whether it is inclined to kidney yang deficiency or kidney yin deficiency. For Kidney yang deficiency, the tongue is pale, fat, tender, and white, accompanied by coldness, warm hands and feet, spontaneous sweating (involuntary sweating during the day, aggravated by sweating with slight movement), prolonged ejaculation, frequent urination, long and clear urination, and oedema, etc., which can be treated by Jin Gui Kidney qi Pill, Yu Gui Pill, etc., in order to warm up the kidney yang. In the case of kidney yin deficiency, red tongue color, thin and thin tongue, little tongue coating, less fluid, etc., accompanied by five heart-heat (heat in the hearts of hands and feet, and self-consciousness of irritability and stuffiness in the heart and chest), dizziness, tinnitus, soreness and weakness of waist and knees, night sweating (sweating abnormally after falling asleep, but sweating stops after waking up), spermatorrhea, premature ejaculation and other conditions, we can use the formulae of Six-flavored Digoxin Pill and Zuoqi Pill with additions or subtractions to treat the condition, to nourish yin and replenish the kidneys. If there is no bias and all the above symptoms are present at the same time, treatment can be given by adding or subtracting formulas such as Di Huang Drink to nourish kidney yin and tonify kidney yang. If there is any discomfort and medication is needed, please consult a doctor promptly and use medication under the guidance of a physician.