Have you ever been called a juvenile? It's actually not an insult — it just
means that you're a kid.
Juvenile rheumatoid arthritis,
or JRA, is called that because it's different from the arthritis that adults get.
Arthritis causes pain and
swelling of the joints. JRA makes it hard for kids who have it to move their joints.
JRA is an autoimmune disease.
That means the immune system attacks healthy cells by mistake. Kids with JRA take
medicine and need to keep their joints moving.