Osteoarthritis is primarily a degenerative joint disease, most commonly occurring in weight-bearing joints and the distal joints of both hands. Therefore, if there is pain in the distal joints of the hands or in joints like the knee, it may be osteoarthritis. Rheumatoid arthritis mainly affects the metacarpophalangeal joints, proximal interphalangeal joints, and both wrists. It is also important to distinguish that in patients with osteoarthritis, inflammation indicators such as sedimentation rate, C-reactive protein, and endocrine factors are usually normal. However, in patients with rheumatoid arthritis, these indicators, including sedimentation rate, C-reactive protein, and rheumatoid factor, are abnormally elevated.