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.
Systemic JIA (also called Still's disease) is the most serious, but least common form of the disease. It affects one or more joints and causes inflammation of internal organs, including the heart, liver, spleen, and lymph nodes. Boys and girls are equally likely to have systemic JIA.