There are several common causes of knee soreness and pain: first, knee strain, long-term excessive weight bearing or prolonged walking can lead to clinical symptoms of knee strain. Patients will show soreness and pain in the knee joint, accompanied by weakness of the knee joint, the patient can not continue to walk normally. Second, the synovial membrane of the knee joint becomes edematous after being cold, which also shows the clinical symptoms of knee joint soreness and pain. The clinical symptoms will be relieved soon after the treatment with hot compresses. Third, during the recovery period of a traumatic injury to the knee joint, the clinical symptoms of soreness and pain in the knee joint will also be manifested. Early diagnosis and early treatment are necessary to achieve rapid relief of clinical symptoms. Patients should pay attention to strengthening the muscle strength around the knee joint to avoid trauma, cold and strain on the knee joint.