I've never gotten migraine headaches themselves, but I've had the visual "auras" that people get before them since I was a teenager. It's a strange flashing-light pattern that I can see, usually in my left field of vision, and it's very distracting. I have them maybe three or four times a year but never get the whammo headaches themselves, which I'm greatful for. Anyway, when I toked with my sister this past summer, I had the flashing-light pre-migraine aura one afternoon before I took a hit or two, and it went away like magic after I inhaled the weed. It was a great relief because usually that flashing lasts a couple of hours at least. I've read good things about migraine relief and weed here.