“Hypnosis has been called ‘believed in imagination.’ It’s a form of highly focused attention,” said Dr. David Spiegel, a psychiatrist at Stanford University. “You control what you focus on and what effect it has on you and your body.” You can learn to become a traffic director of your own thoughts.
Deep mental focus has been credited with helping free divers hold their breath for up to eight minutes and for getting women through childbirth without pain. In 1961, a hypnotized woman had a Cesarean section without anesthetics. “We hear all the time about the incredible ways in which monks and yogis are able to rewire their brains through intense practice,” said Anne Harrington, who wrote “The Cure Within.” “Maybe one important thing we should be doing more of is trying to discover the extraordinary in our own world.”

Take a moment to watch this video of Diane Sawyer discussing hypnosis with Dr. Speigel.
http://abcnews.go.com/Video/playerIndex?id=4345359
http://abcnews.go.com/Video/playerIndex?id=4345359