arthritis

Arthritis is a term often used to mean any disorder that affects joints.[2] Symptoms generally include joint pain and stiffness.[2] Other symptoms may include redness, warmth, swelling, and decreased range of motion of the affected joints.[2][3] In some types other organs are also affected.[6] Onset can be gradual or sudden.[5]

There are over 100 types of arthritis.[4][5] The most common forms are osteoarthritis (degenerative joint disease) and rheumatoid arthritis.[6] Osteoarthritis usually occurs with age and affects the fingers, knees, and hips.[6] Rheumatoid arthritis is an autoimmune disorder that often affects the hands and feet.[6] Other types include gout, lupus, fibromyalgia, and septic arthritis.[6][8] They are all types of rheumatic disease.[2]

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