The diagnostic criteria for rheumatoid arthritis include the following aspects: The first is symmetrical joint pain, primarily characterized by tenderness and swelling in the metacarpophalangeal joints, proximal interphalangeal joints, and both wrists. Secondly, it also includes abnormalities in inflammation markers, which comprise erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP), along with abnormalities in certain antibodies, mainly rheumatoid factor, CCP antibodies, and AKA antibodies. If the above symptoms are present, and these inflammation markers and antibodies are found to be abnormal upon blood testing, a diagnosis of rheumatoid arthritis can be made.