I was on Mirena for over a year and experienced excruciating back pain that I didn't realize was from the Mirena because my Gynoclogist insisted that it didn't have that side effect. I went to doctors and finally a chiropractor that could not understand the kind of pain I was in. It was the worst back pain I have ever had. I couldn't do a thing and would cry it was so painful, and I can handle a lot of pain. Finally, I went on this site and saw that others had experienced this. I had it removed and the pain was GONE. its been a year and NO pain, its unbelievable to me. I also gained 15 lbs that I am having a hard time losing. Don't listen to your doctor if they tell you that you won't have back pain or gain weight!! I'm back to condoms and its fine.