Hypnosis is effective in decreasing the fear of cancer treatment[127] reducing pain from[128] and coping with cancer[129] and other chronic conditions.[116] Nausea and other symptoms related to incurable diseases may also be managed with hypnosis.[130][131][132][133] Some practitioners have claimed hypnosis might help boost the immune system of people with cancer. However, according to the American Cancer Society, "available scientific evidence does not support the idea that hypnosis can influence the development or progression of cancer."[134]

Although he rejected the transcendental/metaphysical interpretation given to these phenomena outright, Braid accepted that these accounts of Oriental practices supported his view that the effects of hypnotism could be produced in solitude, without the presence of any other person (as he had already proved to his own satisfaction with the experiments he had conducted in November 1841); and he saw correlations between many of the "metaphysical" Oriental practices and his own "rational" neuro-hypnotism, and totally rejected all of the fluid theories and magnetic practices of the mesmerists. As he later wrote:
The hypnotized individual appears to heed only the communications of the hypnotist and typically responds in an uncritical, automatic fashion while ignoring all aspects of the environment other than those pointed out by the hypnotist. In a hypnotic state an individual tends to see, feel, smell, and otherwise perceive in accordance with the hypnotist's suggestions, even though these suggestions may be in apparent contradiction to the actual stimuli present in the environment. The effects of hypnosis are not limited to sensory change; even the subject's memory and awareness of self may be altered by suggestion, and the effects of the suggestions may be extended (posthypnotically) into the subject's subsequent waking activity.[12]
Hypnosis has been used as a pain relieving technique during dental surgery and related pain management regimens as well. Researchers like Jerjes and his team have reported that hypnosis can help even those patients who have acute to severe orodental pain.[135] Additionally, Meyerson and Uziel have suggested that hypnotic methods have been found to be highly fruitful for alleviating anxiety in patients suffering from severe dental phobia.[136]
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. 
People have been pondering and arguing over hypnosis for more than 200 years, but science has yet to fully explain how it actually happens. We see what a person does under hypnosis, but it isn't clear why he or she does it. This puzzle is really a small piece in a much bigger puzzle: how the human mind works. It's unlikely that scientists will arrive at a definitive explanation of the mind in the foreseeable future, so it's a good bet hypnosis will remain something of a mystery as well.
Although hypnotherapy can seem strange, perhaps even implausible, it is regarded as potentially effective in treating a variety of ailments, particularly phobias, addictions, and problematic habits. Hypnosis may also be used to help patients cope with stress, smoking cessation, and chronic pain, and some women even opt to use hypnosis to manage the pain of childbirth. In patients with trauma-related conditions such as posttraumatic stress (PTSD), therapists may attempt to talk to clients about their traumatic memories under hypnosis.
"Are you facing some challenging situations in life? Do you struggle with deep dissatisfaction or feelings of emptiness? Change and challenges are a part of life; however, sometimes, we need a little help getting through these difficult times. I believe that we all need someone to talk to who will really listen and accept us how we are. I provided a warm, nonjudgmental environment and a safe place to explore the issues you are facing so you can work towards healing your emotional pain. I work with adults, adolescents and couples who may be facing a wide variety of challenges."
Hypnosis, an enhanced state of inner focus, can be an effective tool for improving a range of symptoms, including those related to mood and learning. The ADHD drug methylphenidate (Concerta, Ritalin) has been shown to increase hypnotizability in a sample of patients with ADHD and thus may enable patients to benefit from adding hypnosis to their treatment regimens.
Hypnotherapy, while thought of by some as something non-scientific, is a regulated, legitimate form of therapy that can both explore and use a person’s subconscious to better help them through psychotherapy, and also act as a method of therapy that helps relieve a person of symptoms and problems they are afflicted with. Hypnotherapy has proven to be extremely effective in cases with patients suffering from pain and addiction.

Last May [1843], a gentleman residing in Edinburgh, personally unknown to me, who had long resided in India, favored me with a letter expressing his approbation of the views which I had published on the nature and causes of hypnotic and mesmeric phenomena. In corroboration of my views, he referred to what he had previously witnessed in oriental regions, and recommended me to look into the Dabistan, a book lately published, for additional proof to the same effect. On much recommendation I immediately sent for a copy of the Dabistan, in which I found many statements corroborative of the fact, that the eastern saints are all self-hypnotisers, adopting means essentially the same as those which I had recommended for similar purposes.[51]
Systems theory, in this context, may be regarded as an extension of Braid's original conceptualization of hypnosis as involving "the brain and nervous system generally".[74](p31) Systems theory considers the nervous system's organization into interacting subsystems. Hypnotic phenomena thus involve not only increased or decreased activity of particular subsystems, but also their interaction. A central phenomenon in this regard is that of feedback loops, which suggest a mechanism for creating hypnotic phenomena.[183]

Relaxation techniques are often integrated into other health care practices; they may be included in programs of cognitive behavioral therapy in pain clinics or occupational therapy in psychiatric units. Complementary therapists, including osteopaths and massage therapists, may include some relaxation techniques in their work. Some nurses use relaxation techniques in the acute care setting, such as to prepare patients for surgery, and in a few general practices, classes in relaxation, yoga, or tai chi are regularly available.

Trance is commonplace. People fall into traces many times without even being aware that it happened. Examples of this are: reaching the destination of a morning commute, but not recalling the passing of familiar landmarks; daydreaming while sitting in a college classroom; or that anxiety-free state achieved just before going to sleep. The difference between these altered states and clinically used hypnotherapy is that a professionally trained person is involved in helping the patient achieve the trance, which can be done in many ways.
Hypnotherapy, while thought of by some as something non-scientific, is a regulated, legitimate form of therapy that can both explore and use a person’s subconscious to better help them through psychotherapy, and also act as a method of therapy that helps relieve a person of symptoms and problems they are afflicted with. Hypnotherapy has proven to be extremely effective in cases with patients suffering from pain and addiction.
Some therapists use hypnosis to recover possibly repressed memories they believe are linked to the person's mental disorder. However, the quality and reliability of information recalled by the patient under hypnosis is not always reliable. Additionally, hypnosis can pose a risk of creating false memories -- usually as a result of unintended suggestions or the asking of leading questions by the therapist. For these reasons, hypnosis is no longer considered a common or mainstream part of most forms of psychotherapy. Also, the use of hypnosis for certain mental disorders in which patients may be highly susceptible to suggestion, such as dissociative disorders, remains especially controversial.
In 1985, The AMA convened a commission that warned against using hypnotherapy to aid in recollection of events. The commission cited studies that showed the possibility of hypnotic recall resulting on confabulation or an artificial sense of certainty about the course of events. As a result, many states limit or prohibit testimony of hypnotized witnesses or victims.
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.
Hypnotherapy is a use of hypnosis in psychotherapy.[84][85][86] It is used by licensed physicians, psychologists, and others. Physicians and psychologists may use hypnosis to treat depression, anxiety, eating disorders, sleep disorders, compulsive gambling, and posttraumatic stress,[87][88][89] while certified hypnotherapists who are not physicians or psychologists often treat smoking and weight management.
Speech, on account of the whole preceding life of the adult, is connected up with all the internal and external stimuli which can reach the cortex, signaling all of them and replacing all of them, and therefore it can call forth all those reactions of the organism which are normally determined by the actual stimuli themselves. We can, therefore, regard "suggestion" as the most simple form of a typical reflex in man.[165]
It is used for a wide variety of applications, and studies into its efficacy are often of poor quality[2] which makes it difficult to determine efficacy. Several recent meta-analyses and systematic reviews of the literature on various conditions have concluded that the efficacy of hypnotherapy is "not verified",[3] that there is no evidence[4][5] or insufficient evidence[6][7] for efficacy.