The correct answer is rheumatoid arthritis. Rheumatoid arthritis is an autoimmune disease that causes chronic inflammation in the joints, as well as in other areas of the body. Rheumatoid arthritis causes the body’s immune system to attack itself, which results in inflammation and causes joint linings to thicken, leading to pain and swelling. Without proper treatment, inflammation can become very severe and can result in bone damage, degeneration, and even bone deformities. Among other symptoms, swelling of the hands and feet are common with rheumatoid arthritis.