birth control
"I've had the Mirena for about 5 months now and I'm still not sold on it.  The pain during insertion was high and I had horrible cramping for the next few days.  My periods are about a week and a half long, granted it is light and is more like spotting but it's real inconvenient.  I still get pretty bad cramps accompanied with it too.  You're told to give it about 6 months to let your body adjust to it so I'm hoping it gets better."