Arthritis is an inflammation of the joints, describing over 200 conditions that affect joints, tissues surrounding the joints, and other connective tissues. It can affect one joint or multiple joints. There are different types of arthritis. Two of the most common types are osteoarthritis and rheumatoid arthritis. The symptoms of arthritis usually develop over time, but they may also appear suddenly. Arthritis is most commonly seen in adults over the age of 65, but it can also develop in children, teens, and younger adults. Arthritis is more common in women than men and in people who are overweight.
Rheumatoid arthritis is a chronic inflammatory disorder that can affect more than just your joints. In some people, the condition can damage a wide variety of body systems, including the skin, eyes, lungs, heart and blood vessels. An autoimmune disorder, rheumatoid arthritis occurs when your immune system mistakenly attacks your own body's tissues