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By Mayo Clinic staffMost complications from adult Still's disease arise from chronic inflammation of your body organs and joints.
- Joint destruction. Chronic inflammation can damage your joints. The most commonly involved joints are your knees and wrists, but your neck, foot, finger and hip joints also may be affected. In severe cases, joint replacement surgery may be necessary for your hip or knee joints.
- Inflammation of your heart. Adult Still's disease can lead to an inflammation of the sac-like covering of your heart (pericarditis) or of the muscular portion of your heart (myocarditis).
- Excess fluid around your lungs. Inflammation may cause an excess of fluid to build up in the fluid-filled space (pleural space) that surrounds your lungs.