RHEUMATOID ARTHRITIS Mauro Keiserman, MD. Rheumatology Specialist by the Brazilian Society of Rheumatology. Head Professor of Rheumatology at the Catholic University School of Medicine (PUC-RS). What is it? Rheumatoid arthritis (RA) is a chronic disease of unknown cause. Its main characteristic is a persistent joint inflammation, but there are cases in which other organs are… Continuar lendo RHEUMATOID ARTHRITIS