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Adult Still's disease is a rare illness marked by high, spiky fevers, rash, and joint pain. It may lead to long-term (chronic) arthritis. Fewer than 1 out of 100,000 people develop adult Still's disease each year. It affects women more often than men.
Still's disease that occurs in children is called systemic juvenile idiopathic arthritis.
The cause of adult Still's disease is unknown. No risk factors for the disease have been identified.