abnormal uterine bleeding
"I was given the Mirena on recommendation from my OBGYN doctor to treat constant bleeding.  I was advised that I could expect spotting throughout the first three months, but that after that it should be very light or non-existent.  Insertion was not horrible, but definitely not fun.  I bled for 4 months straight while on the Mirena, not to mention other not so fun side effects, like bloating, acne, and that awful smell (which they don't warn you about by the way).  I tried additional birth control pills on top of the Mirena, in order to stop the bleeding, but it only worked short term.  Finally I pulled the plug, quite literally actually.  Removal was painless and quick.  I opted for the Depo shot instead.  Miraculously the bleeding stopped!"