Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare.org. We are working closely with our technical teams to resolve the issue as quickly as possible. Thank you for your patience.
Nearly 50 percent of children with JRA are affected by this type of the disease, which affects five or more joints. Polyarticular disease is more serious and tends to affect the small joints, such as the hands and feet, and often on both sides of the body. This type of JRA affects girls more often than boys.