Does arthritis only affect one part of the body?

No There are over a hundred form of arthritis and while they mainly reputed to have an effect on the joints of the body there are forms of arthritis that can have harmful effects on many other parts of the body including the skin, heart, blood vessels, lungs, eyes, brain, etc this is usually more prevalent in inflammatory forms of Arthritis which are autoimmune diseases. Gouty arthritis. is a disease that is the result of too much uric acid in the blood leading to deposits of acid crystals being deposited in joints the kidney and some other parts of the body

No, Arthritis is an inflammatory joint condition and often occurs in a few joints through out the body. A joint is an area of the body where two different bones meet. It functions to move the body parts connected by its bones. When that area becomes inflamed or swells, it becomes painful. The causes of arthritis depend on the form of arthritis. There are over 100 known forms. Causes include injury (leading to osteoarthritis), metabolic abnormalities (such as gout and pseudogout), hereditary factors, infections, and unclear reasons (such as rheumatoid arthritis and systemic lupus erythematosus). The areas most commonly affected include the hands, shoulders, elbows, knees, hips and back.