The treatment of knee pain, swelling and limitation of bending needs to be based on the cause of the disease, and its common causes include knee muscle strain, trauma, synovitis, etc. The treatment mainly includes general treatment, physiotherapy, medication and so on. 1. Knee joint muscle strain: in this case, it is recommended to take more rest, usually can be relieved, can also be localized hot compresses or physical therapy. 2. Trauma: when the above symptoms are caused by trauma, first of all, we need to brake and rest, when the pain and swelling are obvious, we can also use non-steroidal anti-inflammatory drugs, such as aspirin, ibuprofen, etc. to control inflammation and relieve pain. 3. Synovitis: still need to rest more, reduce the activities of the knee joint, can choose non-steroidal anti-inflammatory drugs, such as ibuprofen, celecoxib, etc. for treatment. The above drugs need to be used under the guidance of a doctor. In addition, other causes, such as arthritis, can also lead to the above symptoms. Therefore, if the symptoms of knee pain, swelling and limitation of bending cannot be relieved by rest, it is recommended to consult a doctor to identify the cause of the problem and receive appropriate treatment.