Arthritis means inflammation of joints. Arthritis is very common. There are many causes of arthritis. Children and adults of all ages can be affected by arthritis, although the most common type is osteoarthritis and that affects older people. It is also more common in women than it is in men. See the separate leaflet called Osteoarthritis for more details.
This is a companion discussion topic for the original article at https://patient.info/bones-joints-muscles/arthritis