In his later works, Braid reserved the term "hypnotism" for cases in which subjects entered a state of amnesia resembling sleep. For other cases, he spoke of a "mono-ideodynamic" principle to emphasise that the eye-fixation induction technique worked by narrowing the subject's attention to a single idea or train of thought ("monoideism"), which amplified the effect of the consequent "dominant idea" upon the subject's body by means of the ideo-dynamic principle.[57]
Adverse events resulting from relaxation techniques are uncommon. Rare reports describe basilar or vertebral artery occlusion after yoga postures that put particular strain on the neck. People with poorly controlled cardiovascular disease should avoid progressive muscle relaxation because abdominal tensing can cause the Valsalva response. Patients with a history of psychosis or epilepsy have reportedly had further acute episodes after deep and prolonged meditation.
In 2007, a meta-analysis from the Cochrane Collaboration found that the therapeutic effect of hypnotherapy was "superior to that of a waiting list control or usual medical management, for abdominal pain and composite primary IBS symptoms, in the short term in patients who fail standard medical therapy", with no harmful side-effects. However the authors noted that the quality of data available was inadequate to draw any firm conclusions.[2]

“With hypnosis, you capture people’s attention. … You get people to turn to a more passive state of attention and to stop judging everything. To just let it happen,” Patterson said. “And when you do this, the amazing thing is that it’s as if you’re talking directly to the part of the brain that’s monitoring the reactions.” In his work, he ties suggestions of comfort to the daily practice of caring for burn wounds. “In burn care you know they’re going to pull off the bandages and then they’re going to start washing the wounds,” he explains. “The message is that when your wounds are washed, that will be the reminder of how comfortable you are.” The patient will often look like they’re asleep. “But if you ask them, ‘If you can still hear me, feel your head nod,’ almost always you’ll get that head nod,” he said. He’s seen this work for decades, but is so grateful for the recent advent of brain-imaging studies. They serve as evidence he can hold up to skeptics: See? Do you believe me now?
I paid in the region of 2,000 pounds for hypnotherapy with a fully trained and registered professional hypnotherapist. The hypnotherapy made my problems worse. I find it incredibly frustrating that when I have typed letters to the hypnotherapy organisation that this hypnotherapist belongs to, a lot of what I am actually saying in the letters when explaining exactly why the hypnotherapist's treatment has made me worse, and how my problem works gets ignored. I can see that the Hypnotherapist has not interpreted my problems correctly enough. I do not believe that it is totally fair that this Hypnotherapist's work seems to be above being checked for flaws. I am suffering as a result.
Finally, the neural underpinnings of PHA will be even clearer when we incorporate its most important aspect in imaging studies—the dissociation between implicit and explicit memory. In PHA (and in functional amnesia) the person is unable to explicitly recall certain information, yet we see evidence of this material on implicit measures. For instance, a participant given PHA may fail to recall the word “doctor,” learned earlier, but will have no trouble completing the word fragment “d _ _ t _ r”. Mendelsohn et al. did not assess implicit memory. Rather, they tested recognition, which in a sense confounds explicit and implicit memory. We’d like to compare brain scans of a PHA group trying to explicitly recall the movie (they should show reduced activation, as above) with brain scans of the same group completing an implicit memory measure of the movie (they should show normal activation). This would be tricky to do—implicit measures of complex material such as movies and autobiographical memories are hard to find or construct. But it would contribute to a more complete neural picture of the processes involved in these fascinating forms of forgetting. 
The Federal Dictionary of Occupational Titles describes the job of the hypnotherapist: "Induces hypnotic state in client to increase motivation or alter behavior patterns: Consults with client to determine nature of problem. Prepares client to enter hypnotic state by explaining how hypnosis works and what client will experience. Tests subject to determine degree of physical and emotional suggestibility. Induces hypnotic state in client, using individualized methods and techniques of hypnosis based on interpretation of test results and analysis of client's problem. May train client in self-hypnosis conditioning. GOE: 10.02.02 STRENGTH: S GED: R4 M3 L4 SVP: 7 DLU: 77"[8]