Rheumatoid arthritis is an autoimmune disease that causes chronic inflammation of the joints and surrounding tissues. It can affect multiple organs and is considered a systemic illness. The cause is unknown but is believed to involve genetic susceptibility and environmental triggers activating an immune response. Treatment involves medications to reduce inflammation and slow joint damage, physical therapy, exercise and lifestyle changes, and sometimes surgery. The goals are to relieve pain, reduce inflammation, prevent further joint damage, and improve quality of life.