The diagnosis of rheumatoid arthritis primarily relies on blood tests, radiological examinations, and the patient's own symptoms. Rheumatoid arthritis is often referred to as internal rheumatoid arthritis. For a definitive diagnosis: Firstly, the patient must exhibit symmetrical swelling and pain in the joints of both hands, including the small joints. Further screening through blood tests shows elevated erythrocyte sedimentation rate (ESR) and C-reactive protein, which are two inflammatory markers. Additionally, the presence of rheumatoid factors, anti-CCP antibodies, and AKA antibodies being positive also play a role. Simultaneously, if radiological imaging suggests joint space narrowing and bone damage, this further supports the diagnosis of rheumatoid arthritis.