On hypnosis for pain relief,
This is the largest meta-analysis to date investigating the effectiveness of hypnosis as a technique for pain reduction. Evidence from 85 controlled studies provides convincing evidence that hypnosis produces substantive analgesia, with optimal pain relief delivered when direct analgesic suggestions are used in a target population of individuals high in suggestibility.
Overall, the findings that hypnotic induction resulted in a reliable decrease in experimentally-induced pain suggest that hypnosis may represent a potentially effective and safe alternative or adjunct to pharmacological intervention for acute pain. Well-controlled studies of non-laboratory pain are, however, essential to establish the efficacy of hypnosis for the treatment and management of clinical pain.
Thompson, T., Terhune, D., Oram, C., Sharangparni, J., Rouf, R., Solmi, M., Veronese, N., Stubbs, B. (2019). The effectiveness of hypnosis for pain relief: A systematic review and meta-analysis of 85 controlled experimental trials. Neuroscience & Biobehavioral Reviews. DOI: 99.10.1016/j.neubiorev.2019.02.013