It is defined as an altered state of awareness during which the patient experiences increased suggestibility and during which the patient’s conscious or unconscious mind is more likely to accept ideas uncritically. Normal volunteers who prove to be excellent subjects for hypnosis often report a marked reduction or obliteration of experimentally induced pain, such as that produced by a mild electric shock. The hypnotic state does not lower the volunteer’s heart rate, respiration, or other autonomic responses. These physical reactions show the expected increases normally associated with painful stimulation.

Hypnosis, no longer considered magic; its role in chronic pain is uncertain. Some studies have shown that 15% to 20% of hypnotizable patients with moderate to severe pain can achieve total relief with hypnosis. Other studies report that hypnosis reduces anxiety and depression. By lowering the burden of emotional suffering, pain may become more bearable.