Rheumatoid arthritis is a very broad concept. If rheumatic fever alone is referred to, the patient usually has predominantly large joint involvement, with transient joint pain and milder symptoms of pain, less often leaving joint deformities, and usually resolving on its own. In the case of rheumatoid arthritis, the involvement of small joints is predominant, showing symmetrical involvement of proximal interphalangeal joints, metacarpophalangeal joints and wrist joints. The joint pain is accompanied by morning stiffness that lasts for more than half an hour, and the pain is mildly relieved after activity, while leaving joint deformity and even limited movement after the disease progresses. In elderly patients, the pain in the knee joint is usually considered osteoarthritis, which is characterized by pain that is pronounced during activity and relieved at rest.