Hypnosis -- or hypnotherapy -- uses guided relaxation, intense concentration, and focused attention to achieve a heightened state of awareness that is sometimes called a trance. The person's attention is so focused while in this state that anything going on around the person is temporarily blocked out or ignored. In this naturally occurring state, a person may focus his or her attention -- with the help of a trained therapist -- on specific thoughts or tasks.
Also Receive Training In Clinical Hypnosis. Robert Sapien is a physician and a tenured Distinguished Professor at the University of New Mexico Health Sciences Center.  He serves as principal investigator on several research studies and is recognized nationally as an expert in emergency asthma care and school emergencies.  Dr. Sapien formerly served as the Chief of Pediatric Emergency Medicine at UNM Hospital.  After graduating from the Academy’s clinical hypnotherapy program, he returned as an Associate Instructor and Practical Skills Coach.  Dr. Sapien has incorporated hypnosis in the emergency care of children, as well as conducting grand rounds and other C.M.E. in-services on the use of medical support hypnosis.

A 2006 declassified 1966 document obtained by the US Freedom of Information Act archive shows that hypnosis was investigated for military applications.[148] The full paper explores the potentials of operational uses.[148] The overall conclusion of the study was that there was no evidence that hypnosis could be used for military applications, and no clear evidence whether "hypnosis" is a definable phenomenon outside ordinary suggestion, motivation, and subject expectancy. According to the document:

We know it is hard to sort out all the different claims made by some so-called “hypnosis schools and boards.” Stay away from “distance learning” or correspondence courses that claim to certify you as a clinical hypnotherapist. Hypnosis and hypnotherapy is a healing art based on scientific methods. Only basic hypnotherapy theory can be obtained from the right books or videos. Effectiveness is unlikely without live demonstrations, in-depth and advanced discussion, question and answer opportunities and supervised clinical practice.  Just as correspondence courses are inappropriate for counselors, medical doctors and massage therapists, they are wrong for people who want to be effective and successful clinical hypnotherapists.
Advertisers have used this knowledge forever. They get our focus and then they pull us in with keywords and authoritative speech that enter the subconscious mind, bypassing our mental filters. Even as you read this, your mind is focused on the words you are reading and you are not fully aware of the world around you. So trance is a very natural state of mind and doesn't feel weird or different from what you often feel every day.
Hypnotherapy has been studied for the treatment of irritable bowel syndrome.[117][118] Hypnosis for IBS has received moderate support in the National Institute for Health and Clinical Excellence guidance published for UK health services.[119] It has been used as an aid or alternative to chemical anesthesia,[120][121][122] and it has been studied as a way to soothe skin ailments.[123]
Hypnotherapy has been studied for the treatment of irritable bowel syndrome.[117][118] Hypnosis for IBS has received moderate support in the National Institute for Health and Clinical Excellence guidance published for UK health services.[119] It has been used as an aid or alternative to chemical anesthesia,[120][121][122] and it has been studied as a way to soothe skin ailments.[123]
Jump up ^ Mauera, Magaly H.; Burnett, Kent F.; Ouellette, Elizabeth Anne; Ironson, Gail H.; Dandes, Herbert M. (1999). "Medical hypnosis and orthopedic hand surgery: Pain perception, postoperative recovery, and therapeutic comfort". International Journal of Clinical and Experimental Hypnosis. 47 (2): 144–161. doi:10.1080/00207149908410027. PMID 10208075.
Ernest Hilgard, who developed the "neodissociation" theory of hypnotism, hypothesized that hypnosis causes the subjects to divide their consciousness voluntarily. One part responds to the hypnotist while the other retains awareness of reality. Hilgard made subjects take an ice water bath. None mentioned the water being cold or feeling pain. Hilgard then asked the subjects to lift their index finger if they felt pain and 70% of the subjects lifted their index finger. This showed that, even though the subjects were listening to the suggestive hypnotist, they still sensed the water's temperature.[180]
It appears that hypnosis, under other names, has been used since the beginning of time. In fact, it has been insinuated that the earliest description of hypnosis may be portrayed in the Old Testament and in the Talmud. There is also evidence of hypnosis in ancient Egypt, some 3,000 years ago. However, the man credited with the development of what has become modern hypnosis is Friedrich Anton Mesmer, an Austrian physician. One day, Mesmer watched a magician on a street in Paris demonstrate that he could have spectators do his bidding by touching them with magnets. Fascinated by the demonstration, Mesmer believed the magnets had power of their own and from this belief developed his theory of "animal magnetism." He also believed that good health depended on having correct magnetic flow and that the direction of one's magnetic flow could be reversed easily. He further believed that he could direct this magnetic flow into inanimate objects, that could then be used for the good health of others. The term "mesmerism" came to be applied to his mystical workings. He experienced much success in helping the people of Paris as well as visitors who came from other countries, upon hearing of his powers. Later he was completely discredited by a special commission of the French Academy appointed by the King of France, causing him to leave the country. Two of the more famous members of the French Academy at the time were chairman of the commission Benjamin Franklin, American ambassador to France, and Dr. Guillotine, the inventor of the execution device.
When James Braid first described hypnotism, he did not use the term "suggestion" but referred instead to the act of focusing the conscious mind of the subject upon a single dominant idea. Braid's main therapeutic strategy involved stimulating or reducing physiological functioning in different regions of the body. In his later works, however, Braid placed increasing emphasis upon the use of a variety of different verbal and non-verbal forms of suggestion, including the use of "waking suggestion" and self-hypnosis. Subsequently, Hippolyte Bernheim shifted the emphasis from the physical state of hypnosis on to the psychological process of verbal suggestion:
Poor regulation of hypnosis and deeper relaxation techniques is more serious. Although several professional organizations exist, these groups do not regulate or certify practitioners in hypnotherapy or relaxation. Hypnotherapists with a conventional health care background (such as psychologists, physicians, dentists, and nurses) are regulated by their professional regulatory bodies. Psychotherapists who use hypnotherapy as an adjunctive treatment modality require appropriate training. Individuals who have received a master's degree in counseling or social work or a doctorate in clinical or counseling psychology will be likely to have received appropriate training and supervision.
The term "hypnosis" comes from the ancient Greek word ὕπνος hypnos, "sleep", and the suffix -ωσις -osis, or from ὑπνόω hypnoō, "put to sleep" (stem of aorist hypnōs-) and the suffix -is.[9][10] The words "hypnosis" and "hypnotism" both derive from the term "neuro-hypnotism" (nervous sleep), all of which were coined by Étienne Félix d'Henin de Cuvillers in 1820. These words were popularized in English by the Scottish surgeon James Braid (to whom they are sometimes wrongly attributed) around 1841. Braid based his practice on that developed by Franz Mesmer and his followers (which was called "Mesmerism" or "animal magnetism"), but differed in his theory as to how the procedure worked.
David Lesser[21] (1928 - 2001) was the originator of what we today understand by the term Curative Hypnotherapy.[22] It was he who first saw the possibility of finding the causes of people’s symptoms by using a combination of hypnosis, IMR and a method of specific questioning that he began to explore. Rather than try to override the subconscious information as Janet had done, he realised the necessity- and developed the process- to correct the wrong information. Lesser’s understanding of the logicality and simplicity of the subconscious led to the creation of the methodical treatment used today and it is his innovative work and understanding that underpins the therapy and is why the term ‘Lesserian[23]’ was coined and trademarked. As the understanding of the workings of the subconscious continues to evolve, the application of the therapy continues to change. The three most influential changes have been in Specific Questioning (1992) to gain more accurate subconscious information; a subconscious cause/effect mapping system (SRBC)(1996) to streamline the process of curative hypnotherapy treatment; and the ‘LBR Criteria’ (2003) to be able to differentiate more easily between causal and trigger events and helping to target more accurately the erroneous data which requires reinterpretation.