Arthritis is the swelling and tenderness of one or more joints. The main symptoms of arthritis are joint pain and stiffness, which typically worsen with age. The most common types of arthritis are osteoarthritis and rheumatoid arthritis.
Arthritis is caused by inflammation of the joints. Osteoarthritis usually comes with age and most often affects the fingers, knees, and hips. Sometimes osteoarthritis follows a joint injury. For example, you might have badly injured your knee when young and develop arthritis in your knee joint years later