Arthritis is caused by inflammation inside the joints of the body.
Arthritis is very common and affects almost a third of the American population.
There are many types of arthritis and in general the causes are still unknown. there are some risk factors for arthritis. These may include age, gender, lifestyle factors, and being overweight. With age, the cartilage in the joints wears down causing the most common type of arthritis, osteoarthritis. Arthritis also occurs more often in women than men. Work conditions that require heavy lifting and being overweight cause heavy stress on the joints of the body.