Yin deficiency and exuberant fire is a disease mechanism in traditional Chinese medicine. The effect played by simply knocking on the meridians may be limited, and it needs to be treated under the guidance of a professional physician, who can usually knock on the kidney meridians. Yin deficiency and exuberant fire refers to the deficiency of yin fluid in the human body and its inability to restrain yang qi, resulting in a state of deficiency and heat in which yang qi is partial to the body. It is more closely related to yin deficiency of the liver and kidneys (deficiency of yin fluid in the liver and kidneys), and is most often caused by overexertion, old age and prolonged illnesses, and too much sexual intercourse. Its clinical manifestations are dizziness, tinnitus, five heart-heat (heat in the hearts of the two hands and two feet, and self-consciousness of the heart and chest), hot flashes (a burst of heat), night sweating (abnormal sweating after going to sleep, and sweating stops after waking up), and so on. Yin deficiency and fire can usually be improved by knocking on the Kidney meridian, which mainly treats heat in the center of the feet, sore throat, tinnitus, fear of coldness in the lower limbs, and lumbago. The Kidney meridian runs on the front side of the body, from the foot towards the abdominal chest, starting from the little toes, passing through the center of the foot (Yongquan acupoint), up the inside of the ankle, up the back of the inside of the lower limb, and through the abdominal chest to the subclavian bone. Commonly used acupoints include the Yongquan acupoint (the center of the foot), Rangu acupoint (the medial side of the foot), and Taixi acupoint (the depression on the medial side of the ankle). There are important organs in the abdomen, should not be randomly knocked, if there is discomfort, it is recommended that timely hospital consultation, by the Chinese medicine practitioner to identify and treat, do not self-treatment, to avoid bringing adverse consequences to the body.