Hypnosis Explained: What Suggestion Can and Can't Change

Hypnosis is a state of focused attention in which a person responds to suggestions, often with the feeling that the response is happening to them rather than being done by them. A hand rises, pain dulls, an imagined scene feels vivid, and the person experiences it as automatic. Researchers agree the effects are real. They still disagree about why they happen.

This guide covers where hypnosis came from, the competing explanations, what brain research and clinical trials show, the claims that don’t hold up, and who should take care. It explains hypnosis. It doesn’t teach it, and nothing here is a script or an induction.

What is hypnosis?

The working definition used by many researchers comes from the American Psychological Association’s hypnosis division (Elkins and colleagues, 2015): a state of consciousness involving focused attention and reduced awareness of the surroundings, marked by a greater capacity to respond to suggestion. That definition is careful. It describes what you can observe and leaves open what causes it.

The practitioners whose books inform this site land in a similar place by different routes. Teppo Holmqvist, a hypnotist who has written several manuals on hypnosis and influence, puts it bluntly: as a special state, hypnosis doesn’t exist. What exists is sustained attention held on a frame both people have agreed on, plus expectation. In his later chapters he reduces it further. To get a hypnotic effect, he writes, you need to build the expectation that something will happen, and then reinforce the response.

Anthony Jacquin, a stage and street hypnotist, frames it as a social construct that sets off automatic imagination. You imagine, and the imagining lacks the usual sense of effort, so it feels like it’s happening on its own.

Both men describe the same core: the feeling of involuntariness makes an experience hypnotic. You can picture a beach in vivid detail and stay fully in charge of the picture. Hypnosis begins when the picture seems to arrive without your effort.

Where did hypnosis come from?

The history explains a lot of the modern confusion.

Period	Figure	What they claimed	What happened to the claim
1770s	Franz Anton Mesmer	An invisible magnetic fluid flowed through bodies; blockages caused illness	A French royal commission (1784, including Benjamin Franklin) found the effects came from imagination, not fluid
1840s	James Braid	Coined “hypnotism” from the Greek for sleep; first blamed tired eyes, then a mind absorbed in a single idea	He later regretted the sleep-based name. The sleep link stuck anyway
1880s	Hippolyte Bernheim	Suggestion, not a special state, explains the effects	Close to today’s socio-cognitive view
1950s-70s	Theodore Sarbin, Theodore Barber	Hypnotic behaviour is role-taking and expectation in a social setting	Became the “non-state” camp
1970s	Ernest Hilgard	Hypnosis splits awareness: a “hidden observer” can register pain the subject doesn’t report	Became the dissociation or “state” camp
1980s-now	Irving Kirsch, Steven Jay Lynn	What people expect largely shapes what they experience	Well supported; Kirsch calls clinical hypnosis a “non-deceptive placebo”

Kirsch’s phrase is worth unpacking. A placebo works partly through expectation, but depends on the patient not knowing it’s inert. Hypnosis uses the same expectation openly. The practitioner tells you what’s happening, and it still works. That honesty is one reason clinicians take it seriously.

How does hypnosis work?

Three ingredients show up in every serious account.

Absorption. People who lose themselves easily in books, films or daydreams tend to respond more strongly to hypnosis. Auke Tellegen and Gilbert Atkinson tied hypnotic responsiveness to this trait of absorption in 1974, and the link has held up, though it’s modest.

Expectation. What you expect to feel changes what you feel. In one pain study (Koyama and colleagues, 2005), people expecting a stronger heat stimulus rated the same heat as more painful, and brain regions that process pain responded to match. Hypnosis harnesses this deliberately: the setting, the practitioner’s confidence and the person’s beliefs about hypnosis all shape the result.

The sense of involuntariness. A suggestion such as “your arm is becoming light” works best when the response feels as if it’s happening by itself. Researchers call this the classic suggestion effect. Sceptics and believers in a special state both agree it’s the defining feature.

What about relaxation? Holmqvist calls it a convenient prop. Hypnosis can happen with eyes open, while walking or while alert. Relaxed inductions are common because people expect them, which ties back to expectation.

Practitioners also talk about a critical factor, a mental gatekeeper that hypnosis supposedly slips past. Jacquin concedes that it corresponds to no known part of the brain. It’s a teaching metaphor for the fact that people evaluate suggestions less when absorbed, not a structure you can switch off.

Is hypnosis a special state of mind?

This is the oldest argument in the field, and it’s still open.

The state view, rooted in Hilgard’s work, holds that hypnosis changes how the brain coordinates monitoring and control. Modern imaging gives this some support. A Stanford study led by Heidi Jiang (2017) found that highly hypnotisable people in hypnosis showed reduced activity in a region involved in noticing conflict, and changed connections between areas involved in control, body awareness and self-reflection. Pierre Rainville’s team (1997) showed that suggestions to make pain less unpleasant changed activity in the anterior cingulate cortex, a region linked to how much pain bothers you, without changing activity tied to raw intensity.

The socio-cognitive view holds that attention, expectation, motivation and imagination explain everything, with no special state required. Its strongest evidence is that many hypnotic effects can be produced by suggestion without any induction, and that what people do in hypnosis tracks what they believe hypnosis involves.

Both views can be partly true. Brain changes during hypnosis are real, but there’s no single marker that appears only in hypnosis and nowhere else. Holmqvist’s position sits close to this middle: the brain changes are real, but hypnosis exists as a skill and a concept rather than as one definable state.

Can everyone be hypnotised?

Most people respond to some suggestions, but people differ a lot. This trait is called hypnotisability, or suggestibility in looser use.

On standardised research scales, roughly 10 to 15 percent of people score high, a similar share score low and most land in the middle. The trait is surprisingly stable. When Piccione, Hilgard and Zimbardo retested the same people 25 years later, scores still correlated at around 0.7.

The sources on this site disagree with that research in places. Holmqvist argues that responsiveness reflects trust in a particular hypnotist more than a fixed trait, and that people can be trained to respond more. Training studies (Gorassini and Spanos, 1986) did raise scores, but critics argued that much of the gain reflected people complying with what the training asked of them. The honest summary: rapport and expectation shift responses at the margin, and the underlying trait still matters.

Low hypnotisability isn’t a flaw. People who score low still benefit from many clinical approaches that use hypnosis, and responsiveness doesn’t measure intelligence, weakness of will or gullibility.

What can hypnosis actually help with?

The clinical evidence is real, and narrower than advertising suggests.

Use	What the research shows
Pain, including chronic pain	Among the best-supported uses. Meta-analyses (Montgomery, DuHamel and Redd, 2000; Thompson and colleagues, 2019) find meaningful pain reduction, largest in highly hypnotisable people
Surgery and medical procedures	A brief session before breast surgery reduced pain, distress, anaesthetic use and cost in a trial led by Guy Montgomery (2007)
Irritable bowel syndrome	Gut-directed hypnotherapy, developed by Peter Whorwell, has good evidence; UK clinical guidance suggests it for IBS that hasn’t responded to medication
Added to cognitive behavioural therapy	Adding hypnosis improved outcomes in a meta-analysis by Kirsch, Montgomery and Sapirstein (1995)
Quitting smoking	Cochrane reviews (most recently Barnes and colleagues, 2019) found no reliable evidence that it beats other approaches
Recovering memories	Unreliable. Hypnosis increases confidence and the amount recalled, but much of the extra material is wrong (Dywan and Bowers, 1983)
Weight, sleep, anxiety, confidence	Some promising studies; small and mixed. Treat claims of quick fixes with caution

Notice what the strong results have in common. Pain, procedural distress and gut symptoms are all experiences where attention and expectation already play a large part. Hypnosis seems to work best where the mind already has a hand on the dial.

Holmqvist himself draws limits here. Unless you’re a health professional, he writes, hypnotic pain control can amount to practising medicine without a licence, and it belongs only on a doctor’s referral. He also argues that the aim is never to mask pain completely, because pain carries information. His more useful contribution is a list of beliefs that make pain linger: that it’s constant, that it’s permanent, and that nothing you do affects it. Pain researchers study the same pattern under the name catastrophising (Sullivan and colleagues, 1995).

Can hypnosis make you do things against your will?

Most people come to hypnosis with this question, and the research answer is mostly no.

In the 1950s and 60s, Martin Orne compared hypnotised people with unhypnotised people told to fake it. The fakers did nearly everything the hypnotised group did, including acts that looked dangerous, because both groups knew they were in a safe experiment. The setting explained the behaviour.

Stage shows work for similar reasons. Volunteers are self-selected and then filtered for responsiveness. They’re on stage, in front of a crowd that expects a show, with a confident performer setting the frame.

Not every practitioner accepts the research answer. Jacquin rejects the reassurance that hypnosis can’t make anyone act against their morals. In his view, a person’s ethics are a thin social layer that can fall away once critical thinking is set aside, so the hypnotist carries responsibility for where the moral lines sit. He pairs that with a firm rule of his own: always get permission. The experiments point the other way on his first claim. When William Coe and colleagues (1973) asked hypnotised and unhypnotised people to do questionable acts in a lab, the two groups complied at similar rates. Jean-Roch Laurence and Campbell Perry’s 1988 history of hypnosis in the courts reached the same conclusion: the setting and the relationship drive compliance, not the trance. His second point stands either way. Whoever sets the frame is responsible for it.

The danger comes from ordinary influence pushed hard. Holmqvist’s manual makes this uncomfortably clear: long stretches of it describe conditioning and pressure tactics he says cults and abusers use. The site rejects those tactics and doesn’t reproduce them. Holmqvist himself gives the key ethical point, in his warning about gurus who induce intense states and then claim consent: agreement given under induced arousal, exhaustion or dependence isn’t informed consent. We cover the wider question on our page about whether brainwashing is real.

What hypnosis can’t do

Some claims are common enough to address directly. Our page on hypnosis myths covers them in more depth.

Claim	What’s true
Hypnosis is a kind of sleep	No. Brain activity in hypnosis resembles waking. The word comes from Braid’s early theory, which he later regretted
You can get stuck in hypnosis	No. People come out on their own; at worst they drift into ordinary sleep
You’ll remember nothing	Most people remember the session. Amnesia happens only in some highly responsive people, usually when suggested
Hypnosis can recover hidden memories	It produces confident errors. Courts in many places restrict hypnotically refreshed testimony. See hypnosis and false memories
Your mind can’t tell imagined from real	Overstated. Imagery and perception share circuitry, but the brain keeps telling them apart. See imagination and the nervous system
Hypnosis can sharpen your senses beyond normal limits	Suggestion changes attention and what you report, not how well your eyes or ears physically work
A belief “installed” in trance takes hold in 21 days	No study supports a fixed timeline. Habit research found a median of 66 days with a wide range (Lally and colleagues, 2010)

How does hypnosis relate to belief and identity?

This is where hypnosis connects to the rest of this site.

Maxwell Maltz, the surgeon behind Psycho-Cybernetics, built a chapter around the idea that we’re all hypnotised by beliefs we accepted without checking. He borrowed the argument from Theodore Barber’s research: hypnosis is the power of belief, and a false belief about yourself works like a suggestion you never chose. Neville Goddard modelled his approach to prayer on 19th-century suggestion, and his law of assumption uses the same vocabulary.

The research supports a narrower version of these ideas. Expectation does change experience, including physical responses like pain. It doesn’t change facts outside the person, and it isn’t a lever on reality.

Holmqvist’s chapters on belief add cautions most belief-change teachers skip. Change your beliefs too fast, he warns, and you can lose your sense of who you are; he describes needing months to recover after doing it himself. Use belief change to make bad choices feel acceptable and you’ll stay stuck. Choose a belief the world contradicts every day and it will collapse. He also limits personal responsibility to what you’re aware of and can influence, and calls out people who tell the depressed or traumatised that they attracted it.

Those cautions matter for anyone drawn to identity work. A belief worth adopting is one you can test against reality and keep revising. We go further into this on how hypnotists work with beliefs.

How is hypnosis different from meditation and yoga nidra?

The overlap is real: all three involve sustained, absorbed attention. The difference lies in who steers.

In hetero-hypnosis, a practitioner offers suggestions and the subject responds. In self-hypnosis, you give the suggestions yourself. In yoga nidra, the tradition holds a guided awareness practice in which the only suggestion is the resolve you choose. Swami Satyananda Saraswati, who systematised yoga nidra, drew a firm line between it and hypnosis on that basis. Most meditation practices aim at watching experience rather than changing it.

Research on all of these is still separating shared ingredients from distinct effects, so treat any claim that one is “deeper” or “more powerful” than another with caution.

What the research says

The overall picture, without overstatement:

• The effects are real. Hypnotic suggestion reliably changes pain, perception and the felt control of movement, and imaging shows matching brain changes (Rainville 1997; Jiang 2017).
• The explanation is open. Expectation, absorption and attention explain a great deal. Whether there’s also a distinct hypnotic state is unresolved.
• People differ. Hypnotisability is a stable trait. High responders benefit most for pain; low responders still benefit from many treatments that include hypnosis.
• Clinical value is specific. Pain, procedures, IBS and support for cognitive behavioural therapy have the best evidence. Smoking cessation, memory recovery and quick-fix claims don’t.
• Memory is the danger zone. Hypnosis raises confidence more than accuracy, and it has helped create false memories in therapy settings.
• Coercion is overstated, consent isn’t. No trance overrides a person’s values on its own, but authority, exhaustion, dependence and arousal can all undermine real consent.

Who should take care

Hypnosis is generally safe in trained hands. Mild, short-lived side effects such as headache, dizziness or grogginess are the most common. Some people should take extra care:

• People with psychosis, dissociative conditions or active trauma symptoms should only work with a licensed clinician who’s also trained in hypnosis. Holmqvist says the same: hypnosis isn’t a substitute for psychotherapy, and people with serious mental illness shouldn’t be subjects for these processes because symptoms can worsen.
• Anyone with depression should see a licensed professional first. Holmqvist notes that someone in a depressive episode can’t access positive resources until their state is back in balance.
• Anyone seeking to recover memories of abuse or trauma shouldn’t use hypnosis for it. Work with a licensed trauma therapist.
• Anyone with pain or a medical condition should see a doctor before any hypnotic approach, and shouldn’t use hypnosis to mask symptoms that need investigating.
• Anyone considering a practitioner should check their training and credentials. In many places “hypnotherapist” isn’t a protected title. Leave any session in which you feel pressured, and remember you can stop at any time.

What hypnosis teaches about identity

Take away the props and hypnosis shows you something simple. Ideas you accept, absorb and expect become experiences you live, and they feel as though they’re happening to you rather than being chosen by you. Many of the limits you carry may work the same way: accepted early, never examined and lived as facts.

The research also sets the boundary. Expectation changes how you experience the world, and it leaves the world’s facts where they are. The work is to notice which beliefs you’re running, test them against reality, and choose the ones you’d keep with your eyes open. If you want help doing that in practice, that’s what our coaching is for.

Frequently asked questions

What is hypnosis, in simple terms?

Hypnosis is a state of focused attention in which a person responds to suggestions, often with the feeling that the response is happening by itself. Researchers still argue about whether it is a special brain state or ordinary attention, expectation and imagination working together.

Is hypnosis real or fake?

The effects are real and measurable. People in hypnosis report reduced pain, altered perception and movements that feel involuntary, and brain imaging shows changes when they respond to suggestions. What remains disputed is the explanation, not whether something happens.

Can a hypnotist make you do something against your will?

The research doesn't support a trance that overrides a person's values. Stage subjects are chosen for responsiveness and are under strong social pressure to play along. The real risks are consent, authority, exhaustion and trust being abused, which is why hypnosis should only happen with someone you have good reason to trust.

Can everyone be hypnotised?

Most people respond to some suggestions. On standard research scales, roughly 10 to 15 percent of people score high, a similar share score low and most fall in the middle. The trait is fairly stable over decades, though expectation and rapport shift responses a little.

What is hypnosis actually good for?

The strongest evidence is for pain, including pain and distress during medical procedures, and for irritable bowel syndrome. Hypnosis also adds to the effect of cognitive behavioural therapy. Evidence for quitting smoking is weak, and hypnosis is unreliable for recovering memories.

Is hypnosis dangerous?

Clinical hypnosis with a trained professional is generally safe; the usual side effects are brief headache, dizziness or grogginess. People with psychosis, dissociative conditions or active trauma symptoms should only work with a licensed clinician, and hypnosis should never be used to recover memories.

This article is educational and is not medical, psychological or financial advice. Talk to a qualified professional before making major changes, especially if you live with a mental health condition. Read the full disclaimer.