View this image to find out more about rheumatoid arthritis (RA).
The red joints are those most commonly affected by rheumatoid arthritis.
RA is one of the most serious forms of joint disease, but can exist in a milder form in about 20% of people with RA.
RA occurs when the body's immune system attacks its own organs - in this case the tissues in the joint.
RA is usually symmetrical and affects the joints on both sides of the body at the same time.
The most commonly affected joints are the wrists, fingers, shoulders, knees, ankles and toes. The elbows, hips and the spinal joints in the neck are less commonly affected.
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