True yin deficiency refers to kidney yin deficiency, which is a deficiency of kidney yin, loss of nourishment, and internal disturbance of deficiency heat; yin deficiency can be seen in the pathology of different organs, which refers to the body’s deficiency of yin fluid, and its function of nourishment and moistening is reduced, or yin does not control yang, and yang qi is overbearing. Yin deficiency and true yin deficiency is the relationship between containing and being contained, yin deficiency contains true yin deficiency, and true yin deficiency is contained by yin deficiency. Symptoms of true yin deficiency include lumbar and knee soreness and pain, dizziness, tinnitus, insomnia and dreaminess, weight loss, hot flashes and night sweats (sweating abnormally after falling asleep, but stopping after waking up), and heartburn and heat (heat in the hearts of the hands and feet, and self-consciousness of heart and chest irritation (irritability and sultriness)). The symptoms of Yin Deficiency are: emaciation, dry mouth and throat, flushed cheekbones (reddish color of cheekbones on both sides of the face), heat in the heart, hot flashes and night sweating, short and yellow urine, dry and knotty stools, red tongue with little fluid and moss, and a fine pulse. Yin deficiency can be seen in the lesions of different internal organs, and the common types of evidence include heart yin deficiency, lung yin deficiency, liver yin deficiency, kidney yin deficiency, stomach yin deficiency and so on. If you have any physical discomfort, please go to the hospital for medical treatment.