Vaginal parturition decreases recurrence of endometriosis

Despite several hypotheses, the pathogenesis of endometriosis remains unclear. However, the notion that endometriosis results from the retrograde transport of endometrial debris through the uterine tubes and subsequent implantation in the pelvic peritoneum and visceral organs is compelling. The first clinical consequence of endometriosis is ‘‘infertility,’’ and pregnancy may reduce the recurrence of endometriosis and dysmenorrhea through mechanisms that are not yet clear. The present study evaluated the role of parturition in reducing the recurrence rates of endometriosis and dysmenorrhea. We also investigated the role of uterine internal ostium (IOS) enlargement in the recurrence of endometriosis following vaginal parturition.