Kidney yin deficiency is usually characterized by lumbar soreness and fatigue, dry mouth and sore throat, flushing on both cheekbones, five heart-heat (heat in the hearts of the hands and feet, and self-consciousness of the heart and chest), or flushing in the afternoon. Kidney yin deficiency is mostly caused by injury to essence, depletion of fluid, or depletion of kidney yin by acute febrile illness. Symptoms include lumbago and fatigue, dizziness and tinnitus, spermatorrhea and premature ejaculation, dry mouth and sore throat, flushed cheekbones, hot heart or hot flashes in the afternoon, a red tongue with little or no moss, and a fine pulse (the pulse becomes narrower and finer, and the rate is accelerated). The treatment is to nourish the kidneys and nourish the yin. If there is deficiency of Yin and hyperactivity of Yang, or phase fire, it is advisable to nourish Yin and lower the fire. Kidney yin deficiency people pay attention to do a good job of regulating measures, diet should be reasonable, pay attention to avoid staying up late, do a good job of physical conditioning, you can participate in some sports, enhance the body’s resistance, improve the quality of the body. If there is any discomfort, it is recommended to go to the hospital in time, do not blindly use drugs.