It's not easy to diagnose because depending where the endometrial deposits are, the symptoms can be quite different. It's an unrecognized problem among teenage girls, and it's something that every young woman who has painful menstruation should be aware of ... it's a condition that is curable if it's caught early. If not, if it's allowed to run on, it can cause infertility, and it can really mess up your life. [Author Hilary Mantel on being asked about being a writer with endometriosis, Nov 2012 NPR interview]