Normally, the body’s immune system protects physical health by attacking viruses and bacteria. Rheumatoid arthritis is an autoimmune disorder where causes the immune system to target the joints, instead. This leads to inflammation and therefore a buildup of synovial fluid. If the inflammation continues unchecked, Baker’s cysts form, and the cartilage of the joint weakens. Loose and damaged joints are the logical progression. Rheumatoid arthritis appears more often in women than men and can develop at a younger age than in men.

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