User:Scot15456

•	Polyarticular disease affects five joints or more, sometimes many more. The small joints such as those in the hands and feet are most likely to be affected. This type can begin at any age. In some cases, the disease is identical to adult-type RA. This type accounts for about 30% of cases of JRA. •	Systemic disease affects many systems throughout the body. Children may have high fevers, skin rashes, and problems caused by inflammation of the internal organs such as the heart, spleen, liver, and other parts of the digestive tract. It usually, but not always, begins in early childhood. Medical professionals sometimes call this Still's disease. This type accounts for about 20% of cases of JRA.