Learn all about rheumatoid arthritis , from symptoms , diagnosis, and treatments, to types, diet tips, and how it differs from osteoarthritis. Rheumatoid arthritis is a disease that affects far more than your joints. Find out some of the common and rare symptoms and complications of RA. RA symptoms can be subtle at first, making early diagnosis difficult. Here are key early warning signs to watch for: Morning stiffness lasting over an hour – Unlike regular stiffness, RA stiffness can persist for most of the morning or even all day. Rheumatoid arthritis is an autoimmune disease that affects multiple joints, resulting in pain, swelling, and stiffness. Tiredness and fever may also be present.