I've never really had migraines before... maybe one or two in my life. My wife and stepdaughter get really bad premenstrual migraines. I had the Mirena put in around Feb or March of this year and I've noticed the past 4 months I have had a migraine usually a day or two before my period. My periods are getting lighter but my headaches are getting worse. Thankfully I've been able to treat it OTC successfully (1 aspirin, 1 ibuprofen, and 1 Tylenol taken all together kicked it this last time) and they aren't completely debilitating. Also, it seems to only last a day or two and then it's over.