Endometriosis is a chronic condition in which tissue normally lining the uterus’ interior walls also grows outside the uterus, commonly to the ovaries, fallopian tubes, or pelvis –- causing pelvic pain and infertility.
“It affects women during their reproductive years and it could be that as many as 10% of women during reproductive ages have endometriosis,” says Victoria Holt, a researcher at the Fred Hutchinson Cancer Research Center, a professor of epidemiology at the University of Washington and lead study author.
More than 5 million women have endometriosis, according to the U.S. Department of Health and Human Services’ Office of Women’s Health.
“What we know about endometriosis is that it’s an estrogen-driven disease. Women who have more estrogen are more likely to have it,” Holt says.