abnormal uterine bleeding
"I am 25 and got my Minera a little over a month ago.  I have a very high pain tolerance, but I won't lie to insertion hurt a lot, but I also haven't had children.  I spotted bad for two weeks, and then that stopped, now I just get random cramps sometimes, but nothing compared to the disabling cramps I got while on the pill.  My random back pain has also almost completely gone away.  I feel like I have come out of a brain fog and can think better.  I am no longer crying at everything and feel much more myself--even my husband has mentioned I seem more myself.  I also have much more of a libido now--my husband loves it.  We aren't ready for kids yet, so not having to remember to take a pill every days has really helped me not stress over sex."