Uterus perforation is one of the most severe complications of Mirena IUD. According to the IUD Lawsuit Center | Mirena Class Action, the complication requires immediate removal of Mirena. It seems that such a complication arises during the insertion. However, exceptions have been reported too. Mirena may also migrate randomly and spontaneously way after the installation. If it goes out of the uterus, it can also destroy the intestines and cause obstructions. Scarring is the most common issue. However, infertility can also occur. Do not hesitate to seek legal help for such side effects. Get in touch with a specialized lawyer right away.