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https://medium.com/@madhuvanth....is1999/9-unusual-sym
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An autoimmune disease that mostly affects the joints, rheumatoid arthritis (RA) is characterised by inflammation, discomfort, swelling, and stiffness. When the immune system unintentionally targets the synovium—the lining of the membranes surrounding the joints—rheumatoid arthritis develops, in contrast to osteoarthritis, which is brought on by wear and tear on the joints.