Hypnotherapy and expanded consciousness can be powerful techniques for the period before a surgery, during a surgery, and after a surgery. Before surgery, hypnosis is used to reduce fear, the expectation of pain, or eliminate potential negative predictions and strengthen positive expectations. In that way, tension is released, while trust in the process and the outcome itself is increased. Doctors confirm that this has a great impact on the course of the operation as well as the post-operative period. Patients go into surgery more calmly, and their positive expectations impact their overall health.

Hypnotic anesthesia was used in the times before modern anesthetics became available. It was the only known way to calm the patient. In modern society it is used to support conventional anesthesia. Analyses show that positive hypnotic suggestions given to the patient during surgery can control bleeding, reduce the required dose of anesthesia, and significantly reduce the dosage of painkillers needed after surgery.