I was considering Mirena at one time. I looked it up online and came across a web page (don't know where it was) where literally thousands of women voiced complaints about Mirena. People having their hair fall out, the device going through the uterus, and migraines was a common concern. I don't remember all of the side effects they talked about (this was a number of years ago) but it scared me away.

Try looking up side effects of Mirena, but I would avoid their official site. I try to find sites where people discuss their experiences rather than a list of side effects.

Hope that's helpful.