 There's a complexity to it, but simply the result of the way the head is sitting on top of the neck. I have never, ever taken care of a case of migraine, and I've taken care of hundreds that didn't have a displacement between the base of the skull and the top of the neck, sometimes several millimeters. It doesn't take much at all. And what happens is that the muscles at the base of the skull at the top of the neck get very