I can only find upsides of hypnosurgery on its Wikipedia page:
- fewer side effects
- patients can leave the hospital sooner
- reduction in blood loss
- post-operative nausea
What are the downsides of hypnosurgery (vs. using traditional anaesthetics)?
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Tefikow, S., J. Barth, S. Maichrowitz, A. Beelmann, B. Strauss, and J. Rosendahl. "Efficacy of Hypnosis in Adults Undergoing Surgery or Medical Procedures: A Meta-analysis of Randomized Controlled Trials." Clinical Psychology Review 33.5 (2013): 623-36. Web.
Here's a peer reviewed meta analysis that also found hypnosis to be beneficial during surgery when compared with standard care.
However, most of the studies they cite aren't very large and there definitely needs to be more study in this area before any conclusions can be drawn; positive or negative. Some logistical downsides I can think of would be: