Effect of guided imagery on length of stay, pain and anxiety in cardiac surgery patients:
Cardiac surgery patients who listened to a preop guided imagery surgical tape had significantly less pain, anxiety and two days shorter hospital stay. 1999 J Cardiovasc Manag 10; 2:22-8 Tusek, D. L., Cwynar, R., and Cosgrove, D. M.

Effect of hypnosis on nausea and vomiting in chemotherapy patients.
(NaturalNews) The Journal of Oncology discussed a study on chemotherapy patients who experienced nausea and vomiting and the effects of hypnotherapy as an adjunctive treatment. The results were positive and showed that Hypnotherapy had a positive effect on patients suffering from anticipatory nausea, which comes prior to chemotherapy treatment.  Read more here.

Hypnosis for nausea and vomiting in cancer chemotherapy: a systematic review of the research evidence.
Studies report positive results including statistically significant reductions in anticipatory and CINV (chemotherapy-induced nausea and vomiting). Meta-analysis revealed a large effect size of hypnotic treatment when compared with treatment as usual, and the effect was at least as large as that of cognitive-behavioural therapy. Meta-analysis has demonstrated that hypnosis could be a clinically valuable intervention for anticipatory and CINV in children with cancer. Richardson J, Smith JE, McCall G, Richardson A, Pilkington K, Kirsch I., Eur J Cancer Care (Engl). 2007 Sep;16(5):402-12.

Hypnosis and irritable bowel syndrome: a review of efficacy and mechanism of action.
IBS is a functional gastrointestinal disorder characterized by abdominal pain, distension, and an altered bowel habit for which no cause can be found. Despite its prevalence, there remains a significant lack of efficacious medical treatments for IBS to date. In this paper we reviewed a total of 14 published studies (N=644) on the efficacy of hypnosis in treating IBS (8 with no control group and 6 with a control group). We concluded that hypnosis consistently produces significant results and improves the cardinal symptoms of IBS in the majority of patients, as well as positively affecting non-colonic symptoms. When evaluated according to the efficacy guidelines of the Clinical Psychology Division of American Psychological Association, the use of hypnosis with IBS qualifies for the highest level of acceptance as being both efficacious and specific. In reviewing the research on the mechanism of action as to how hypnosis works to reduce symptoms of IBS, some evidence was found to support both physiological and psychological mechanisms of action. Tan G, Hammond DC, Joseph G. Michael E. DeBakey VA Medical Center, Baylor College of Medicine, Houston, TX 77030, USA.

Preoperative instruction for decreased bleeding during spine surgery:
Spinal surgery patients who were given a preoperative suggestion to decrease blood loss at surgery had significantly less blood loss than a relaxation or a control group. 1986 Anesthesiology 65; A245 Bennett HL, Benson DR Kuiken DA.

A quantitative and qualitative pilot study of the perceived benefits of autogenic training for a group of people with cancer.
This paper describes the application of autogenic training (AT), a technique of deep relaxation and self-hypnosis, in patients diagnosed with cancer, with the aim of increasing their coping ability, and reports the results of a questionnaire survey performed before and after an AT course. A reduction in arousal and anxiety can help individuals to perceive their environment as less hostile and threatening, with implications for improved perceived coping ability. Complementary therapies are considered useful in enhancing symptom relief, overall well-being and self-help when used as adjuvant therapies to allopathic medical interventions. The present study aimed to validate, in an Irish context, the effectiveness of AT as a complementary therapy for patients with cancer. Each participant completed a Hospital Anxiety and Depression Scale and Profile of Mood States questionnaire before and after a 10-week AT course. The results indicated a significant reduction in anxiety and increase in 'fighting spirit' after compared with before training, with an improved sense of coping and improved sleep being apparent benefits of AT practice. Wright S, Courtney U, Crowther D., Eur J Cancer Care (Engl). 2002 Jun;11(2):122-30.

Hypnosis and immunity following periods of stress
COLUMBUS, Ohio - Researchers have determined that hypnosis and related relaxation techniques can actually prevent the weakening of the immune response that often follows periods of acute stress.  Read more here.