- Juvenile means that the arthritis begins before the age of 16.
- Idiopathic means that we don’t yet know what cause it.
- Arthritis means that one or more joints are inflamed.
JIA is really a group of illnesses, put under the same name because they share similar symptoms. There are several different types of JIA: oligoarthritis, polyarthritis JIA, systemic-onset JIA, psoriatic arthritis and enthesitis-related JIA.
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