“There is no single test that doctors can use to diagnose JIA. However, they may suspect that a child has the disease if he or she is younger than age 16 and has unexplained joint pain, stiffness, or swelling that has lasted for at least 6 weeks. Doctors usually diagnose JIA by ruling out other conditions that have similar features.  The goals of treatment are directed on control inflammation, reduce pain and stiffness, prevent joint and organ damage, preserve and improve joint function, promote physical and psychosocial growth and development, and achieve remission.  Most children with JIA need a combination of medicines and a healthy lifestyle, including a balanced diet and exercise, to reach these goals. The specific treatment plan will depend on the child’s age, the type of JIA, and on other factors, such as disease severity. In general, doctors will treat the disease aggressively early on, tapering off medications once remission is reached.”

National Institute of Arthritis and Musculoskeletal and Skin diseases – NIH (https://www.niams.nih.gov/health-topics/juvenile-arthritis/diagnosis-treatment-and-steps-to-take)