Bad kidney, specifically which aspect is bad, whether it is kidney yin deficiency, kidney yang deficiency or both yin and yang deficiency. If kidney yin deficiency, clinical manifestations can be hot flashes and night sweats, heat in the heart of the hands and feet, dry mouth and throat, fond of cold drinks, short and red urine, dry stools, red tongue with little coating, thin and weak pulse, etc., can take Liu Wei Di Huang Wan. Kidney-Yang deficiency is seen in the clinical condition of soreness and coldness of the waist and knees, lazy speech, cold fear of cold extremities, loose stools, clear and long urine, pale tongue with white coating and moist, weak pulse, etc. Jin Kui Kidney Qi Pill or Right Return Pill can be used. For those with heavy deficiency of both yin and yang, clinically seen as general thinness, impotence and spermatorrhea, soreness and weakness of the waist and knees, and prolonged infertility, Turtle and Deer Erxian Gum can be taken. Therefore, the specific medication should be taken according to the specific clinical manifestations and the specific prescription after identification by a professional herbalist. Do not take drugs on your own, which may cause adverse consequences.