From the American Psychological Association:

     Hypnosis has been used for centuries for pain control, including during the Civil War when Army surgeons hypnotized injured soldiers before amputations. Recent studies have confirmed its effectiveness as a tool to reduce pain. Among the leading researchers in the field is Guy H. Montgomery, PhD, a psychologist who has conducted extensive research on hypnosis and pain management at Mount Sinai School of Medicine, where he is director of the Integrative Behavioral Medicine Program.

     In one study, Montgomery and colleagues tested the effectiveness of a 15-minute pre-surgery hypnosis session versus an emphatic listening session in a clinical trial with 200 breast cancer patients. In a 2007 article in the Journal of the National Cancer Institute (Vol. 99, No. 17), the team reported that patients who received hypnosis reported less post-surgical pain, nausea, fatigue and discomfort. The study also found that the hospital saved $772 per patient in the hypnosis group, mainly due to reduced surgical time. Patients who were hypnotized required less of the analgesic lidocaine and the sedative propofol during surgery.

      "Hypnosis helps patients to reduce their distress and have positive expectations about the outcomes of surgery," Montgomery says. "I don’t think there is any magic or mind control."

  

      In a 2009 article in Health Psychology (Vol. 28, No. 3), Montgomery and colleagues reported on another study, which found that a combination of hypnosis and cognitive-behavioral therapy could reduce fatigue for breast cancer patients undergoing radiation therapy.

      Research has also shown the benefits of hypnosis for burn victims. In a 2007 report in Rehabilitation Psychology (Vol. 52, No. 3), Shelley Wiechman Askay, PhD, David R. Patterson, PhD, and colleagues at the University of Washington Medical School found that hypnosis before wound debridement significantly reduced pain reported by patients on one pain-rating questionnaire.