actually, from what i have heard about the copper IUD is that it doesnt cause nearly as many problems because it has no hormones, one of my friends have it and I talked to her yesterday and she said she hasnt had problems but its because its hormone free but in the case of the Mirena, because your body wasnt made with all of those hormones at such strong levels, your body goes into shock and tries to get rid of the contraption itself, almost think of it as having a child, once your baby is grown, the body expells it because it isnt suppose to be there anymore. I dont have the IUD, was going to, did research, changed my mind instantly with the first thing i read on this site. I have enough problems as it is, i dont need more. And i have heard of a few others i know with the copper IUD and dont have problems but like everyone says, everyone is different, it still is something that was naturally not there to begin with.