Juvenile idiopathic arthritis (JIA), also known as juvenile rheumatoid arthritis (JRA), is the most common form of arthritis in children and adolescents. (Juvenile in this context refers to an onset before age 16, idiopathic refers to a condition with no defined cause, and arthritis is the inflammation of the synovium of a joint.)
JIA is a subset of arthritis seen in childhood, which may be transient and self-limited or chronic. It differs significantly from arthritis commonly seen in adults (osteoarthritis, rheumatoid arthritis), and other types of arthritis that can present in childhood which are chronic conditions (e.g. psoriatic arthritis and ankylosing spondylitis). It is an autoimmune disorder. The disease commonly occurs in children from the ages of 7 to 12, but it may occur in adolescents as old as 15 years of age, as well as in infants. JIA affects approximately 1 in 1,000 children in any given year, with about 1 in 10,000 having a more severe form
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Imogen was not even three when she was diagnosed with Juvenile Idiopathic Arthritis. She has Polyarticular JIA.
Her full story is told on the site.
Kids Get Arthritis Too!