Is Hypnosis Safe? What the Research Actually Says

The short answer

For most people, hypnosis is safe when a trained, credentialed practitioner guides it. In reviews of clinical trials, serious side effects from hypnosis are essentially unreported. The mild effects that do happen — brief drowsiness, dizziness, headache, or light anxiety — fade quickly. The real cautions are using memory-recovery techniques that can plant false memories, and using hypnosis with certain conditions like active psychosis.

That is the honest version. The rest of this page shows you the evidence, the limits, and who should be careful. We will also debunk the scary myths from stage shows. Those fears are real, but they do not match what clinical hypnotherapy actually is.

What does the research say about hypnosis side effects?

Hypnosis has one of the better safety records among talk-based therapies. But "good record" is not the same as "zero risk." Here is what the studies show, and what they leave out.

How rare are serious side effects?

Serious side effects appear to be very rare. A 2018 study reviewed adverse-event data from hypnosis trials registered with the U.S. government. It found the rate of serious adverse events likely caused by hypnosis was 0%. The rate of other, milder adverse events was 0.47% — fewer than 1 in 200 people (Bollinger, 2018).

A larger 2024 review backs this up. It pulled together 49 meta-analyses covering more than 20 years of hypnosis research. No serious adverse events were documented across those reviews (Rosendahl et al., 2024).

Here is the honest caveat. Many hypnosis trials did not track or report side effects at all. In that 2024 review, safety data showed up in fewer than half the studies. So "no serious events reported" partly reflects gaps in reporting, not just an absence of harm. The signal is reassuring. It is not airtight.

What are the common, mild side effects?

When side effects do happen, they are mild and short-lived. The Cleveland Clinic lists the most common ones (Cleveland Clinic, 2025):

• Dizziness


• Drowsiness or fatigue


• Headaches


• Increased anxiety


• Trouble sleeping

Some people also notice vivid mental images or strong emotions coming up. A trained practitioner expects this and helps you handle it. These effects usually pass on their own, much like the grogginess after a deep nap.

Why is the evidence of harm so thin?

This is the part competitor pages skip. The lack of harm in the research is partly real and partly a reporting gap. Both things are true at once.

The real part: hypnosis does not use drugs, needles, or anything physical. It is focused attention plus suggestion. There is simply less that can go wrong than with many medical procedures.

The gap part: as noted above, lots of trials never recorded side effects. So we cannot claim a hard count of "zero." The fair summary is this. The harm that has been studied is small and mild — and the bigger worry is using the wrong technique or working with someone untrained, not hypnosis itself.

Who should NOT be hypnotised? (Contraindications)

Hypnosis is not right for everyone in every situation. A qualified clinician screens for this before starting. The point is not to scare you off. It is to match the method to the person.

Reviews and clinical sources flag extra caution for people with (NCCIH; BSCAH review):

• Active psychosis — such as schizophrenia with current delusions or hallucinations.


• Severe dissociative disorders — including dissociative identity disorder.


• Uncontrolled bipolar disorder.


• Certain neurological conditions — such as a history of seizures, narcolepsy, or dementia.


• Trouble sustaining attention — since hypnosis relies on focus.

Some people may need to modify or avoid certain mind-body techniques rather than skip hypnosis entirely. That can include people who are pregnant or who have other serious untreated mental-health conditions. The right move is not a blanket ban. It is working with a clinician who is trained in your specific condition and can adjust the approach.

If any of these apply to you, that is exactly the kind of thing to raise upfront. A good practitioner will ask. If you need help vetting one, see our guide on how to find a hypnotist.

What hypnosis CANNOT do (and three big myths)

Most fears about hypnosis come from stage shows and movies, not the clinic. Here are the three myths that scare people most — and what the evidence actually says.

Myth 1: It can make you act against your will

It cannot. Hypnosis does not override your values or force you to do things you object to. You stay aware, and you can stop or refuse at any point. The Cleveland Clinic puts it plainly: hypnosis "isn't mind control or brainwashing," and "you'll always be in control of your mind and thoughts" (Cleveland Clinic, 2025).

Stage performers look like they have lost control. They have not. They chose to volunteer, they are often highly suggestible, and there is social pressure to play along for the show.

Myth 2: You can get "stuck" in hypnosis

You cannot get stuck. Hypnosis is not sleep or a coma. It is a state of focused attention you can leave whenever you want. If a session were interrupted, you would simply drift back to normal awareness on your own, or fall into a short natural sleep and wake up as usual.

Myth 3: It is mind control and you black out

Neither is true. You do not lose awareness, and no one is controlling your mind. Most people stay fully aware during hypnosis and remember the session afterward. You are an active participant the whole time, more like a deeply focused daydream than a switch being flipped.

The one real risk people underestimate: false memories

Here is the risk that is genuinely documented — and it is about memory, not physical danger.

Using hypnosis to "recover" forgotten memories is risky. It does not reliably improve accurate recall. Worse, it can make people more confident in memories that are false (Frontiers in Psychology, 2025). This is why major professional and legal bodies caution against using hypnotically "refreshed" memories as evidence in court.

An ethical practitioner knows this. They do not use hypnosis to dig up "buried" memories as if it were a reliable recorder. They use it for goal-focused work — managing pain, easing anxiety, supporting habit change. If someone promises to recover lost or repressed memories through hypnosis, treat that as a red flag.

Clinical hypnotherapy vs. stage hypnosis

Almost every fear about hypnosis traces back to the stage. The two are not the same activity.

Stage hypnosis is entertainment. The performer picks the most suggestible volunteers from a crowd. The whole point is a fun, surprising show, and there is real pressure to perform. That setting is where most reported problems cluster — not the clinic.

Clinical hypnotherapy is consenting, goal-directed care. You and the practitioner agree on a specific aim. There is no audience, no trick, and no demand to perform. It is recognized as a real clinical tool. The American Psychological Association's hypnosis division defines it as a focused state of attention with an enhanced response to suggestion (Elkins et al., 2015).

When you read a scary hypnosis story, ask one question first: was it a stage show or a clinic? The answer usually explains it.

Can everyone be hypnotised?

No, and that fact is reassuring. Hypnotizability is a stable trait that varies from person to person. Roughly two-thirds of adults can be hypnotized to a useful degree. A smaller group is highly responsive, and a meaningful minority barely responds at all (Stanford Medicine).

This matters for safety. Hypnosis is not done to an unwilling person. It needs your participation and focus. If you do not want to engage, it does not work. You are a participant, never a target.

Curious whether it would help for your goal? Our explainer on whether hypnosis works walks through the evidence by condition.

How to make hypnosis as safe as possible

The single biggest safety lever is who you choose. Side effects are rare and mild precisely when a trained, credentialed practitioner is guiding the session (Cleveland Clinic, 2025; NCCIH).

A few simple checks:

• Look for someone licensed in a healthcare field — such as psychology, counseling, medicine, social work, or nursing — with additional hypnosis training.


• Ask whether they screen for the conditions listed above.


• Be wary of anyone promising to recover lost memories.


• Make sure they explain the plan and answer your questions before you start.

For a fuller checklist, see how to find a hypnotist. If you are weighing your options, you might also compare hypnotherapy and CBT or hypnosis and EMDR, and read what happens in a first session.

Frequently asked questions

Is hypnosis safe?

For most people, yes — when a trained, credentialed practitioner guides it. Serious side effects are very rarely reported in clinical trials, and the mild effects that occur are short-lived. The main cautions are certain mental-health conditions and memory-recovery techniques, which a qualified clinician will screen for.

What are the side effects of hypnotherapy?

When side effects happen, they are mild and brief. The most common are dizziness, drowsiness, headache, increased anxiety, and trouble sleeping. Some people notice vivid images or strong emotions surfacing. These usually fade on their own, and a trained practitioner helps you work through them.

Who should not be hypnotised?

Extra caution is advised for people with active psychosis, severe dissociative disorders, uncontrolled bipolar disorder, or certain neurological conditions like a seizure history. People who are pregnant or have serious untreated mental illness may need a modified approach. A qualified clinician screens for these before starting.

Can you be hypnotised against your will?

No. Hypnosis needs your willing participation and focus. It cannot be forced on someone who does not want to engage, and it cannot make you act against your values. You stay aware and can stop at any time.

Can you get stuck in hypnosis?

No. Hypnosis is not sleep or a coma. It is a focused state you can leave whenever you choose. If a session were interrupted, you would simply return to normal awareness or drift into a brief natural sleep and wake up as usual.

Can hypnosis create false memories?

Yes — this is the one well-documented risk. Using hypnosis to "recover" memories can increase confidence in memories that are false. Ethical practitioners avoid using it as a memory-recovery tool. Be cautious of anyone who promises to unlock buried or repressed memories.

Can everyone be hypnotised?

No. Hypnotizability varies from person to person and is a stable trait. About two-thirds of adults can be hypnotized to a useful degree, while a minority respond little. It depends on you, not on the practitioner's "power."

Is self-hypnosis safe?

For most people, yes. Health authorities report that self-hypnosis appears safe with no documented injuries. If you have a condition listed in the contraindications above, check with a clinician first (NCCIH).

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Hypnosis is safest in the hands of a properly trained practitioner who screens for the conditions above and answers your questions first. Browse the A Hypnotist Near Me directory to find a certified hypnotherapist near you — including in New York, Los Angeles, and Chicago.

This article is for general information and is not medical advice. Talk to a qualified clinician about your individual situation.