Knee pain may be caused by high uric acid, elevated uric acid leads to gouty arthritis, but in addition to this there may be bone trauma, synovitis or rheumatism, rheumatoid arthritis caused. 1. Gouty arthritis: the presence of high levels of uric acid in the patient’s body may lead to the deposition of urate crystals in the joints to stimulate the production of inflammation, then the patient will appear knee, elbow, toe, finger and other joint pain. 2. Bone trauma: knee joint pain, redness and swelling may occur after the knee joint is injured by external force. 3. Synovitis: there is a large amount of fluid in the synovial membrane of the knee joint of patients with synovitis, leading to increased pressure in the joint cavity, resulting in pain and swelling of the knee joint. 4. Rheumatism, rheumatoid arthritis: rheumatoid arthritis and rheumatoid arthritis patients’ knees due to inflammation will lead to knee pain, swelling, joint deformation and other symptoms. There may be other reasons for knee pain, and it is recommended that patients with knee pain go to a regular hospital for treatment.