1. RA Affects More than 1 Million Americans

There are several types of inflammatory arthritis, in which a reaction from the body's immune system causes joint pain and stiffness. In rheumatoid arthritis (RA), the immune system targets the synovial tissue that lines the joints. It's the most common type of inflammatory arthritis, striking 1.3 million Americans and counting. More than 75% of people with RA are women.

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Medically Reviewed By: McDonough, Brian MD

Last Annual Review Date: March 29, 2011


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Biologic RA medicines can be injected in the front of your thighs or abdomen. Injection sites should be rotated so that the same site is not used repeatedly.