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Overview

Juvenile rheumatoid arthritis (JRA), also called juvenile idiopathic arthritis, juvenile chronic arthritis, and Still's disease, is the most common form of childhood arthritis in the United States. JRA is defined as joint inflammation lasting 6 weeks or longer in children under the age of 16.

JRA is often a mild disorder that causes few problems over time, but some children who have the condition experience significant joint and tissue damage. In severe cases, juvenile rheumatoid...Read the full article