Juvenile rheumatoid arthritis (JRA) is the most common chronic rheumatologic disease in children and is one of the most common chronic diseases of childhood. The etiology is unknown, and the genetic component is complex, making clear distinctions between the various subtypes difficult. A new nomenclature, juvenile idiopathic arthritis (JIA), is being increasingly used to provide better definition of subgroups.

Lists of diseases and disorders, signs, symptoms