Have just come accross this forum on the net.
Ive had my Mirena for 3 years and thought everything was just fine and dandy with it. Had no side affects or problems of any sort. Then I went for my first pap smear since getting it. After only ever having had normal smears, I now have an abnormal smear grade 3 (worst kind). Im not sure if it is cancer yet, still waiting for the biopsy. Im now wondering if it is the Mirena that has caused this. The nurse said it was quite unusual to go from normal smear result to stage 3 abnormal in 3 years. All health professionals including a good friend who is a nurse insist it wont be related to the Mirena. Im now thinking about getting it taken out, though in my experience there are no decent alternatives!