Knee and elbow pain can be caused by the following reasons: first, rheumatism and rheumatoid, rheumatism and rheumatoid can often lead to symmetrical joint pain, often worsened in the morning, and can be accompanied by symptoms of morning stiffness, which should be diagnosed by early blood tests and X-rays of the elbow and knee joints. Second, gout, when the gout involves the joints, it can be multiple joint pain, can be accompanied by swelling and gout stone formation, then the blood uric acid test and X-ray of the elbow joint and knee joint, MRI to diagnose and early treatment. Thirdly, osteoarthritis and osteoarthrosis, both of which can have multiple joints and lead to joint pain, swelling and deformity, should be diagnosed and treated at an early stage by early medical examination and joint X-ray and CT.