The causes of soreness in the lateral thighs of patients are as follows: a. Functional pain: mainly because of acute trauma and chronic strain injury, minor acute muscle and joint sprains, pain often occurs suddenly, the local may not have any abnormalities, only manifesting as painful activity or slight dysfunction, if local swelling and petechiae are found, symptomatic treatment such as hot compresses, paste of blood-activating and pain-relieving creams can be used. Second, chronic strain pain: seen in poor posture or strenuous exercise, poor posture can make certain muscles in a contracted state for a long time, which leads to muscle soreness. Patients doing an unskilled exercise or too much exercise, there will also be a certain side of the limb or a local pain, corrected the bad posture, after sufficient rest, the symptoms will naturally disappear. Third, organic damage: such as osteomyelitis, septic osteoarthritis, bone and joint tuberculosis, rheumatoid arthritis, etc.