1. Living Near Major Road May Boost Rheumatoid Arthritis Risk - US News and World Report
And women closest to traffic were 63 percent more likely to develop the disease, study says

2. High Birth Weight Doubles Risk of Rheumatoid Arthritis - US News and World Report
  MONDAY, June 30 (HealthDay News) -- The risk of rheumatoid arthritis is twice as high in women who had a heavy birth weight (more than 10 pounds) than those with an average birth weight (7 to 8.5 lbs), a new study finds.

3. Rheumatoid arthritis : Causes, incidence, and risk factors  (Trust Mark: Doctor-Reviewed)
The cause of RA is unknown. It is considered an autoimmune disease. The body's immune system normally fights off foreign substances, like viruses. But in an autoimmune disease, the immune system confuses healthy tissue for foreign substances. As a...• Reviewer: Ariel D. Teitel, MD, MBA, Chief, Division of Rheumatology, St. Vincent's Hospital, New York, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

4. Rheumatoid Arthritis  (Trust Mark: Doctor-Reviewed)
Rheumatoid arthritis (RA) is a chronic inflammatory disease affecting the joints, most often in the hands and feet. It results in swelling, stiffness, pain, and sometimes joint, bone, and cartilage destruction.• Author: Genevieve T. Slomski PhD