* In children it is called juvenile idiopathic arthritis (JIA), which describes arthritis with no known cause in people under 16. It shows up mainly in younger children, and most forms are more common in girls. Doctors can treat JIA, and most sufferers can lead active lives
* There are three main types of JIA. Oligoarticular JIA is the most common, affecting up to four joints (usually knees, ankles or wrists). This type has reasonable recovery rates but there is a risk of eye problems. Polyarticular JIA, or polyarthritis, develops at any age, involves five joints or more, and has similar symptoms to adult rheumatoid arthritis. Systemic onset JIA begins with rashes, fever, general malaise and swollen glands, and then develops into inflammation of the joints
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