I have iud for over a year and consistent periods. a week before my period should start, i got extreme cramps (felt like i was dying) and bright red bleeding. it calmed down and i had my period on track. its happening again same way. what should i do?

Many potential: causes. Endometriosis, is at the top of the list, it is an often painful disorder in which tissue similar to the tissue that normally lines the inside of your uterus — the endometrium — grows outside your uterus. Endometriosis most commonly involves your ovaries, fallopian tubes and the tissue lining your pelvis. An exam and testing with your doctor is advised.