abnormal uterine bleeding
"I have had Mirena for about 9 months now. Before I was on the pill with a period for four days. I switched to Mirena because it was just easier than remembering to take a pill. Shortly after the insertion I had severe pain and bleeding. A month later I started spotting then bleeding for over a week. This would occur every couple of weeks. It was irritating but I thought it would have gotten better. Now 9 months later I experience periods for 2-3 weeks straight with constant bleeding. I am fine for a week, and the entire process begins. I am switching back to the pill."