Just as the term "arthritis" can be used to describe a number of different conditions in adult patients, juvenile arthritis is an umbrella term that encompasses over 100 different childhood inflammatory and autoimmune conditions. Approximately 1 in 250 children in the U.S. has been diagnosed with a form of juvenile arthritis. While symptoms can vary across juvenile arthritis types, the most common include joint pain and stiffness, swelling, rashes, and fevers.