Sore legs and weak body may be caused by deficiency of qi and blood or deficiency of kidney essence, excessive exercise and so on. It can be regulated by medicines such as tonifying the middle and benefiting the qi pill and six-flavored dihuang pill. 1. Deficiency of qi and blood: the muscles, sinews and bones of the whole body depend on the nourishment of qi and blood; if qi and blood are deficient, the sinews, bones and muscles will be deprived of nourishment, and then there will be weakness of the whole body and soreness of the legs. Under the guidance of a doctor, you can take medicines to replenish qi, such as tonifying qi pills. 2. Kidney essence deficiency: Kidneys are the master of bone and marrow (meaning that kidneys control the production of bone marrow and affect the growth and development of bones), and are the master of bones and joints, and kidney essence deficiency will cause symptoms such as leg soreness and weakness. Under the guidance of a doctor, you can use drugs such as six flavors of dihuang pills to alleviate the symptoms, six flavors of dihuang pills have the effect of nourishing yin and tonifying the kidneys. 3. Excessive exercise: If you suddenly increase the amount of exercise, it may lead to the emergence of leg soreness and weakness. The symptoms can be relieved with proper rest. After excluding the physiological causes, patients with leg soreness and weakness should go to regular hospitals in time for diagnosis and treatment by professional Chinese medicine. Drugs should be used under the guidance of a physician, do not take on your own.