ARTHRITIS
Arthritis is wearing away of joints with inflammation and pain.
OSTEOARTHRITIS
Because of breakdown of cartilage between bones.
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Cartilage: Firm flexible tissue which covers the ends of joints and forms structures such as external ear. If one is diagnosed with osteoarthritis, one has to take care of kidneys.
RHEUMATOID
It extends to all body joints. Cartilage and Synovial membrane inflamed by the loss of synovial fluid.