Rheumatoid arthritis - Wikipedia, the free encyclopediaRheumatoid arthritis (RA) is a chronic, systemic inflammatory disorder that may affect many tissues and organs, but principally attacks flexible (synovial) joints.Rheumatoid Arthritis: Diagnosis & Test - WebMD - Better ...Discover the steps your doctor will take and the tests you can have to determine if you have rheumatoid arthritis. DiagnosisRheumatoid arthritis - Diagnosis - University of Maryland Medical ...Description An in-depth report on the causes, diagnosis, treatment, and prevention of rheumatoid arthritis.