The main causes of knee pain are knee injury, degenerative knee disease, synovitis, etc. Physiotherapy, medication, surgery and other treatments should be chosen according to the cause of the disease. 1. Knee injury: external factors can lead to patella fracture, cartilage surface contusion, ligament tear, etc., the degree of injury is mild can be given conservative treatment such as plaster or brace fixation, oral painkillers and other treatments, serious injury should choose surgical treatment. 2. Knee degenerative disease: such as chondromalacia patella, osteoarthritis, the lesion stimulates the soft tissue, the symptoms of knee pain will appear. Oral non-steroidal drugs such as ibuprofen, oral glucosamine, chondroitin sulfate, etc. can be prescribed to promote cartilage repair. 3. Synovitis: When the synovial membrane is cold or overworked, it can cause local inflammatory edema, and the knee joint will have obvious pain. Oral non-steroidal drugs such as ibuprofen can be taken as prescribed by the doctor, and physical therapy such as ultrashort wave and electromagnetic therapy can be chosen to promote the absorption of inflammation. Patients who find knee pain should actively seek medical examination to clarify the cause of the disease and then standardized treatment.