Actually, several women on this site have been diagnosed with Rheumatoid Arthritis after getting Mirena inserted and they had no history of joint problems prior to Mirena. Also, there are some women who have been thrown into an estrogen dominant state because of their reactions to Mirena. So, whether or not "short term use of Mirena causes life long health problems" is definitely questionable, if not quite possible if you read through some of these posts. I'm always happy to hear that someone is having a positive experience with Mirena. But, in my opinion, so far you are winning the "Mirena Lottery". It's true, you won't know until you try it. But, is it worth the risk of finding out? I don't like those kinds of odds when it comes to my health and I'm never going to gamble with it again.