Arthritis is swelling and pain of the joints. When this problem is chronic, the most common form is juvenile idiopathic arthritis (JIA). There are many other forms of arthritis and other problems such as lupus that have some overlap with JIA. Different types affect the small or large joints and have different characteristics. The causes of JIA are not well understood, but it is related to the body fighting itself, which is called autoimmune disease.
Abnormal Immunity: An Overview
Source: Managing Chronic Health Needs in Child Care and Schools: A Quick Reference Guide.
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