Rheumatoid joint pain is mainly caused by inflammation. The basic pathological changes of the disease are inflammation of the synovial membrane and abnormal proliferation of the synovial membrane, which leads to the gradual erosion of the tissues in the joints, causing destruction of the joints and pain, which eventually leads to joint deformity and loss of function. Rheumatoid arthritis, itself a chronic systemic inflammatory disease, is also an autoimmune disease. Rheumatoid arthritis is often accompanied by swelling, pain and stiffness in the affected joints during the active phase of the disease. In the late stage, deformity gradually appears, and in severe cases, the joints may become fibrous or bony ankylosis, and joint movement may be gradually restricted until complete loss of function and inability to care for oneself. Therefore, early diagnosis and effective treatment are crucial.