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Bursitis and tendinitis result from irritation caused by injuring or overusing a joint. Bursitis affects a small sac that helps muscles move easily; tendinitis affects the tendons that attach muscle to bone. Treatments include anti-inflammatory drugs, heat or cold, and exercise.
There are many more types of arthritis and related diseases including ankylosing spondylitis, juvenile rheumatoid arthritis, polymyalgia rheumatica, and lupus erythematosus.