Rheumatoid arthritis can be initially self-tested by the site of pain in the affected joints, the amount and nature of pain. 1. Rheumatoid arthritis usually refers to arthritis caused by rheumatic fever, mainly manifested as wandering joint pain, often involving large joints, such as elbows, knees, ankles and other joints, joints localized redness, swelling and pain. It may also be accompanied by skin rashes, subcutaneous nodules and carditis. 2. Sometimes rheumatoid arthritis is also called rheumatoid arthritis, which mainly manifests as symmetrical small arthritis, often involving the fingers of both hands, toes, wrists, elbows, knees, ankles, and other joints, joints are swollen and painful, limited movement, and joint deformity can occur in the later stage. Since there are many causes of rheumatoid arthritis and the clinical symptoms often overlap with each other, the accuracy of self-testing is relatively low, and it is still recommended to go to the hospital and have a specialist doctor make an overall judgment through examination in order to get an accurate diagnosis.