Kidney-Yin deficiency syndrome is a series of symptoms caused by deficiency of kidney-Yin in the body, loss of nourishment, and internal disturbance of deficiency heat, with specific manifestations such as lumbar and knee soreness and tenderness (a feeling of soreness and weakness in the lumbar and knee areas), five heart-quietness and heat (heat in the hearts of the hands and the feet, and self-consciousness of heart-quietness and chest-quietness), hot flushes (bursts of fever), and night-sweating (abnormal perspiration after falling asleep, and perspiration stops after waking up), and so on. 1. Kidney system symptoms: soreness and pain in the waist and knees, dizziness, tinnitus, forgetfulness, loss of teeth and hair, insomnia, emaciation, heat in the heart, hot flashes and night sweats, bone evaporation and heat, and dry pharynx and zygomatic redness (reddish color in the cheeks and zygomatic bones). 2. Reproductive system manifestations: men’s yang strength (the penis does not become soft for a long time after erection, and semen overflows on its own), easy lifting, spermatorrhea and premature ejaculation, women’s menstrual periods are scanty, menstrual periods are closed, or metrorrhagia (menstrual periods are too heavy or more than a few drops). 3. Tongue and pulse: red tongue with little fluid, little or no moss, fine pulse (pulse becomes narrower and thinner and faster). Kidney-Yin insufficiency is mainly manifested in soreness and weakness of the waist and knees, as well as conditions related to the male and female reproductive systems. If you experience symptoms of Kidney-Yin deficiency, it is recommended that you go to the hospital as soon as possible and have your doctor take the appropriate treatment according to your condition so that you do not miss out on your condition.