< Back to All Videos thirdAGE > What is Rheumatoid Arthritis? Up Next... 10 Supplements and Bone Health Supplements and Bone Health Technology and Hand Pain Yoga and Back Pain Loading the player ... Bone + Joint Health What is Rheumatoid Arthritis? Why does rheumatoid arthritis, or RA, cause the body to mistakenly attack the joints, and what can be done to help? Related Videos Supplements and Bone Health Technology and Hand Pain Yoga and Back Pain Treating Knee Osteoarthritis