Arthritis is a condition often characterized by inflammation or swelling of one or more joints. It includes more than 100 conditions that affect the joints. Learn about arthritis, one of the most common chronic conditions in the United States. Arthritis causes pain in the joints and the tissues surrounding the joints. The article looks at the symptoms, types, causes, and treatments. Learn about how different types of arthritis affect joints in different ways, along with how to get relief from arthritis pain. Our trained Helpline team is here to help answer your questions about arthritis and how to manage it. They can tell you about open enrollment for insurance, important changes to Medicare drug plans, treatment options, navigating medical systems and more. Arthritis affects joints and causes symptoms like pain and stiffness. There are more than 100 types. Treatment is managing your symptoms or joint replacement. Learn more about the diagnosis and treatment of Arthritis. Find tips to get ready for any appointments you need. Arthritis and other rheumatic diseases are common conditions that cause pain, swelling, and limited movement. They affect joints and connective tissues around the body. Arthritis involves chronic inflammation and stiffness in one or more joints. Learn more about common causes, diagnostic tests, and treatment options. Arthritis is not one disease. Learn about the different types of arthritis, how they differ and why it’s important. Arthritis is a general medical term used to describe a disorder in which the smooth cartilagenous layer that lines a joint is lost, resulting in bone grinding on bone during joint movement. [2] Symptoms generally include joint pain and stiffness. [2].