Adult-onset Stills disease is an inflammatory condition characterized by high fevers, rash, sore throat, and joint pain. As it progresses, adult-onset Stills disease may lead to chronic arthritis and other complications. Stills disease was named after an English doctor named George Still, who described the condition in children in 1896. Stills disease which occurs in children (those under the age of 16) is now known as systemic onset juvenile rheumatoid arthritis (JRA). In 1971, the term adult Stills disease was used to describe adults who had a condition similar to systemic onset JRA. The cause of adult-onset Stills disease is unknown. No risk factors for the disease have been identified. Theres no cure for adult-onset Stills disease; however, treatment may offer symptom relief and help prevent complications. 
What is (are) Adult-onset Stills disease ?