Well, it's not so much about research, it's that I have had them done many times, that's why I asked where in the c-spine they were doing them. I have neck problems and have had C-6 through C-7 done many times, hoping if I didn't have the neck pain, maybe I wouldn't get migraine's (you know the chicken and the egg thing). But that wasn't the case. I was referred to a pain specialist who wanted to do blocks and then a radio frequency ablation at C-2 and C-3 , but she did a trial of 3 with just lidocaine, no steroids, and on the third one I had an unrelated bad reaction ( so she refused to proceed) so I went back to the doctor who had done the other injections and they said they would try them with the steroid, no trial, but they would not do an ablation that high and it was unlikely it would help with my migraines. But like I said, I'm trying anything these days. You probably haven't found much research on it for migraines because generally that isn't what it's used for. Even the doctor who was going to do it for my migraines documented my chief complaint as "neck pain ". If they are doing it any lower than C-4 I would question them, if not, you just have to decide whether or not you think it's worth it. It would be like getting one Botox injection. I can let you know Friday how I feel. When is yours scheduled for?