Rheumatoid arthritis is characterized by inflammation of the joint membrane. The autoimmune disease causes constant irritation and breakdown of the synovial membrane. The resulting inflammation disrupts synovial fluid production and allows unwelcome substances to enter the joint cavity. Osteoarthritis is a common disorder of synovial joints and is often related to age. The condition occurs when the cartilage between bones breaks down, and the bone itself starts to wear away. Excessive synovial fluid within joints is a painful symptom of osteoarthritis.

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