Juvenile idiopathic arthritis was formerly known as juvenile rheumatoid arthritis or juvenile chronic arthritis.
It presents as chronic joint swelling, pain with functional limitation for at least 6 weeks of unknown cause that starts before 16 year of age.
It is the most common autoimmune-autoinflammatory disease in children.
Around half of the children with juvenile idiopathic arthritis may have active disease until adulthood.