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How does morning stiffness in rheumatoid arthritis differ from pain in osteoarthritis?

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Morning stiffness is a hallmark feature of rheumatoid arthritis, typically lasting about two hours. Patients with this condition often experience joint pain following prolonged periods of inactivity.1

In contrast, osteoarthritis pain is typically exacerbated by extended activity. While both conditions involve joint discomfort, they differ significantly in their underlying causes: rheumatoid arthritis is a chronic, progressive autoimmune disease characterized by inflammatory changes in the synovial membranes, whereas osteoarthritis is a joint disease primarily associated with the progressive deterioration of articular cartilage and is not characterized by the same degree of excessive joint inflammation.123