This study is a pilot randomised controlled trial (RCT) comparing a single, online, group-based session of hypnosis followed by self-hypnosis for people with migraines or tension-type headaches with a wait-list control. A battery of self-report measures and a 2-week headache diary will be administered online at baseline (weeks 0 and 1), post-intervention (weeks 7 and 8) and at follow-up (weeks 11 and 12).
