abnormal uterine bleeding
"I've had the Mirena for 6 months and I have had bad cramps everyday since it was inserted. I have also either bled and had discharge every day to the point I am anemic. I have had trouble getting the doctor's to take it out, so if you are having similar issues, be an aggressive advocate for yourself. My experience is probably not representative. I have had strong side effects from oral birth control pills, including cramps and bleeding frequently. I also have emotional side effects and fatigue."