Arthritis in children, with onset before 16 years of age. The terms juvenile rheumatoid arthritis (JRA) and juvenile idiopathic arthritis (JIA) refer to classification systems for chronic arthritis in children. Only one subtype of juvenile arthritis (polyarticular-onset, rheumatoid factor-positive) clinically resembles adult rheumatoid arthritis and is considered its childhood equivalent.

Synonyms: Juvenile Rheumatoid Arthritis, Juvenile Psoriatic Arthritis, Polyarthritis, Juvenile, Rheumatoid Factor Negative, Juvenile Oligoarthritis, Juvenile-Onset Stills Disease, Juvenile Idiopathic Arthritis, Still Disease, Juvenile-Onset, Juvenile Systemic Arthritis, Juvenile Onset Still Disease, Arthritis, Juvenile Idiopathic, Arthritis, Juvenile, Juvenile Chronic Arthritis, Still's Disease, Juvenile Onset, Enthesitis Related Arthritis, Juvenile, Stills Disease, Juvenile-Onset, Arthritis, Juvenile Rheumatoid, Enthesitis-Related Arthritis, Juvenile, Still's Disease, Juvenile-Onset, Still Disease, Juvenile Onset, Arthritis, Juvenile Enthesitis-Related, Idiopathic Arthritis, Juvenile, Arthritis, Juvenile Chronic, Juvenile-Onset Still's Disease, Systemic Arthritis, Juvenile, Oligoarthritis, Juvenile, Juvenile Enthesitis-Related Arthritis, Rheumatoid Arthritis, Juvenile, Psoriatic Arthritis, Juvenile, Arthritis, Juvenile Systemic, Polyarthritis, Juvenile, Rheumatoid Factor Positive, Juvenile Onset Stills Disease, Juvenile-Onset Still Disease, Juvenile Arthritis, Chronic Arthritis, Juvenile, Arthritis, Juvenile Psoriatic