Although rheumatoid arthritis is often a chronic disease, it tends to vary in severity and may even come and go. Periods of increased disease activity ?"Drill Pill  called flare-ups or flares ?" alternate with periods of relative remission, during which the swelling, pain, difficulty sleeping, and weakness fade or disappear.Swelling or deformity may limit the flexibility of your joints. But even if you have a severe form of rheumatoid arthritis, you'll probably retain flexibility in many joints.Illustration comparing rheumatoid arthritis and osteoarthritisOsteoarthritis, the most common form of arthritis, involves the wearing away of the cartilage that caps the bones in your joints.http://www.strongmenmuscle.com/drill-pill/