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What are the different types of juvenile idiopathic arthritis (JIA)?

There are many different types of juvenile idiopathic arthritis (JIA). The main ones are the following:

  • Oligoarticular. Oligoarticular is the most common type of JIA. Articular means joint in Latin and oligo is Greek for a few. So oligoarticular JIA only affects a few joints, usually four or less. It normally affects big joints, like the knees, wrists or ankles.
  • Polyarticular. Polyarticular JIA affects five or more joints. Poly means many.
  • Systemic. Systemic JIA is the most serious. It affects the whole body.
  • Psoriatic. In psoriatic JIA, arthritis is combined with the skin rash known as psoriasis, or nail changes.
  • Enthesitis-related. Sometimes in JIA, the immune army attacks tendons and ligaments. That’s called enthesitis-related arthritis, or ERA. Tendons are the ropes that hold muscles onto bones. Enthesis is the name of the places where tendons attach to bones.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.