Kidney yin deficiency can cause the body to lose weight. Kidney yin deficiency is mostly caused by prolonged illness, too much sex, prolonged late-night, unhealthy diet, etc., there are five heart heat (two hearts and two feet of the heart of the heat, and self-consciousness of the heart and chest heat), hot flashes (a burst of heat), night sweats (after going to sleep sweating abnormally, waking up sweating to stop), and wasting and other symptoms. Kidney yang deficiency is mostly due to factor body yang deficiency, old age and physical decline, too much intercourse, prolonged illness, or other visceral pathology injury to kidney yang caused by the general manifestation of lumbar and knee soreness (lumbar and knee soreness and weakness of the sensation of) cold and pain, limbs are not warm, fear of cold, depression, male impotence and premature ejaculation, women’s uterine cold infertility and other symptoms. While Kidney Yin deficiency is mostly caused by prolonged illness, too much sex, prolonged staying up late, unhealthy diet, etc. It is usually manifested as symptoms such as five heartburn, hot flashes, night sweating, emaciation, soreness of the waist and knees, vertigo, tinnitus, and insomnia and dreaminess. Therefore, Kidney Yin deficiency can cause a person to lose weight. If the patient’s wasting symptoms are serious, or if the symptoms persist and do not get better, he should go to the hospital in time for treatment.