Because some women might have endometriosis, but do not have symptoms, it is difficult to know exactly how many women have the condition. Current estimates suggest that 6% to 10% of women of reproductive age have endometriosis,1,2 or approximately 5 million women in the United States.N
In 2011, the NICHD-led Endometriosis: Natural History, Diagnosis, and Outcomes study found that 11% of a group of women with no symptoms of endometriosis actually had the disorder. If this finding applies to all the women in the United States, the number of American women with endometriosis may well exceed previous estimates of 5 million.
Endometriosis is most common in women in their 30s and 40s,3 but it can affect any female who menstruates.
Studies show that women are at higher risk for endometriosis if their:
Studies also show that some factors may lower the risk for endometriosis, including:
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