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Juvenile rheumatoid arthritis (JRA), often referred to by doctors today as juvenile idiopathic arthritis (JIA), is a type of arthritis that causes joint inflammation and stiffness for more than six weeks in a child aged 16 or younger. It affects approximately 50,000 children in the United States.
Rheumatoid arthritis (RA) is an autoimmune disease that causes inflammation of the joints. Because many symptoms of RA are similar to those of a variety of other diseases, diagnosis can be difficult.A correct diagnosis requires clinical evaluation, X-rays, and a series of laboratory tests.he Mayo Clinic reports that juvenile RA is the most common type of arthritis in children under age 16. Symptoms may be temporary or last for a lifetime. Like adult RA, symptoms of juvenile RA include joint inflammation, stiffness, and pain.