I'm 42, have been having horrendous bleeding, was referred to the hospital & diagnosed with several small fibroids but as the uterus lining was not very thick, the fibroids would be benign. I have been prescribed norethisterone in the short term, but longer term, could the fibroids become malignant or is benign tissue always likely to remain benign in the uterus? I have been advised to have a mirena, but I did try this 5 years ago and bled constantly. Any suggestions or advice would be greatly appreciated. I did have a fibrocystic breast lump removed a couple of years ago which was very frightening and I don't want to go to that place again!