During the menstrual cycle, a woman’s body undergoes changes to prepare for a potential pregnancy. One of these changes is the growth of the endometrium, a layer of tissue lining the inside of the uterus which, in the event of pregnancy, provides a suitable environment for the embryo’s development.
Endometriosis is characterized by the abnormal growth of endometrial tissue outside the uterus, typically in the ovaries, fallopian tubes, bladder, or intestines. This additional endometrial tissue also sheds and bleeds during the menstrual period.
This abnormal growth causes menstruation to be more painful and, in some cases, debilitating, as the inflamed endometrial tissue can affect other organs and tissues.