Internal fire is on the heavy side, and internal deficiency mostly refers to the deficiency heat syndrome, i.e., yin deficiency and fire (deficiency of yin essence in the body, resulting in hyperactive deficiency fire), which needs to be regulated with medicines for nourishing yin and lowering fire (nourishing the yin essence and lowering the fire), and related acupoints. In Chinese medicine, it is believed that people with yin deficiency and fire exuberance have a deficiency of yin and a relatively high level of yang in their bodies, so they tend to have symptoms such as afternoon hot flashes (a burst of heat), nighttime fever, heat in the hands, feet and heart, flushing of the face, dry mouth and pharynx, and lumbar and knee soreness and tenderness (a feeling of soreness and tenderness of the lumbar and knee areas). For patients with this syndrome, both Yin-nourishing and fire-reducing medicines can be used, such as Huang Jing, Dendrobium, Sha Shen, Maidong, and Sheng Di as well as Six-flavored Di Huang Pills, Sha Shen and Maidong Soup, and Beneficial Stomach Soup. In addition, you can also choose acupoints that nourish yin and reduce fire, such as Sanyinjiao, Taixi, and Ren Yu. Among them, Sanyinjiao is located on the inner side of the calf, Taixi is located between the tip of the inner ankle and the Achilles tendon, and Ren Yu is 1.5 inches beside the posterior midline and flat on the spinous process of the 2nd lumbar vertebra. Specific medication is recommended to consult a doctor, acupuncture points need to be operated by a doctor, massage and so on can be carried out under the guidance of a doctor.