After a 40-year decline, cases of rheumatoid arthritis are on the rise among American women. According to a Mayo Clinic study reported by BBC News, cases rose 2.5 percent between 1995 and 2007.

"We observed a modest increase of rheumatoid arthritis incidence in women during the study period, which followed a sharp decline in incidence during the previous four decades," said Dr. Sherine Gabriel.

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