Rheumatoid Arthritis (RA) Signs & Symptoms (& Associated Complications) Rheumatoid Arthritis (RA) is a chronic autoimmune condition involving inflammatory polyarthritis and other extra-articular manifestations. In this lesson, we discuss the signs and symptoms of RA, including hallmark clinical findings, stages of disease, complications and associated conditions. I hope you find this lesson helpful. If you do, please like and subscribe for more lessons like this one!