IL17A and endometriosis: In this review, we attempt to outline the roles of IL-17 in endometriosis, present the regulatory mechanism of IL-17 expression in endometriosis, identify the biological function (regulation of ectopic endometrial lesions, recruitment and function regulation of immune cells, and angiogenesis) of IL-17 in endometriosis, and discuss prospects in the potential treatment of these patients as well.