An Autoimmune Condition, Not Simple Wear and Tear
Rheumatoid arthritis is an autoimmune condition in which the immune system attacks the lining of the joints, causing inflammation, pain, stiffness and swelling. Unlike osteoarthritis, which is primarily a wear-and-tear condition, rheumatoid arthritis is a systemic autoimmune disease: it can affect multiple joints symmetrically, and it can also involve fatigue, generalised weakness and periods of increased disease activity known as flare-ups.