ISHWAR ORTHOPAEDIC & JOINT REPLACEMENT HOSPITAL Arthritis literally means joint inflammation. Arthritis is not a single disease. Arthritis refers to a group of more than 100 rheumatic diseases and other conditions that can cause pain, stiffness and swelling in the joints. Any part of your body can become inflamed or painful from arthritis. Some rheumatic conditions can result in debilitating, even life-threatening complications or may affect other parts of the body including the muscles, bones and internal organs. The two most common types of arthritis are osteoarthritis and rheumatoid arthritis. Arthritis can affect anyone at any age, including children. The incidence of arthritis increases with age, but nearly three out of every five sufferers are under age 65.