Arthritis, itself a group of more than 100 different diseases, is one category of rheumatic diseases.
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Arthritis and other rheumatic diseases are common conditions that cause pain, swelling, and limited movement. They affect joints and connective tissues around the body. Millions of people in the U.S. have some form of arthritis.
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Diagnosing arthritis and other rheumatic diseases is often difficult, as many symptoms are similar among the different diseases.
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Joints are the areas where two or more bones meet. Most joints are mobile, allowing the bones to move.
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