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One of the various types of JIA, SJIA is a rare form of chronic, or persistent, arthritis. Like other forms of arthritis, SJIA is a disease that usually causes swelling and pain in the joints. While there are multiple kinds of arthritis that affect children aged 2 years and older, SJIA is rare in that it affects the whole body and not just the joints. SJIA is characterized by arthritis, fever, and a salmon-pink rash.