How hypnosis works

Does Hypnosis Work on Everyone?

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No. People differ in how strongly they respond to hypnosis, and on standard research scales about one person in ten scores low. But a low score is not the same as “it will not help me.” Whether hypnosis helps you depends on your responsiveness, on the problem you bring and on what the evidence shows for that problem, and at least one well-known line of research found benefits that did not depend on responsiveness at all.

How much do people differ?

A great deal, and in a fairly stable way. According to the Wikipedia article on hypnosis, the Stanford, Harvard and similar susceptibility scales sort people into high, medium and low responders, with roughly 80 percent scoring medium, 10 percent high and 10 percent low. These are approximate figures. Hypnotizability scores are highly stable over a person’s lifetime.

In practice that means:

  • High scorers respond to a large share of a scale’s test suggestions.
  • Medium scorers, the large majority, respond to some and not others.
  • Low scorers respond to few.

So “does hypnosis work on everyone?” has a plain answer at the level of the experience: it does not land the same way for everyone.

Who tends to respond most strongly?

Research by Deirdre Barrett, summarized in the same article, found two distinct types of highly responsive people.

Fantasizers score high on absorption scales. They find it easy to block out the world around them without hypnosis, spend much time daydreaming, report imaginary companions in childhood and grew up with parents who encouraged imaginative play.

Dissociaters often have a history of childhood abuse or other trauma and learned to escape into numbness and to forget unpleasant events. When they “daydream,” it is more often going blank than building a vivid fantasy.

Both types score equally high on formal scales. The article adds that among clinical groups, people with dissociative identity disorder show the highest hypnotizability, followed by people with post-traumatic stress disorder. That is worth knowing for a reason beyond curiosity: high responsiveness is not always a sign of a rich imagination, and for some people it is linked to past trauma, which calls for a clinician who can recognize and work with that.

Researchers are also looking for biological markers. A 2025 review of pediatric clinical hypnosis describes a 2023 exploratory study that tested whether variants in three genes (COMT, OPRM1 and MAO-A), previously linked to adult hypnotizability, predict how 144 children aged 8 to 18 with functional abdominal pain respond to hypnotherapy. It found no significant association between those variants and treatment success after three months. For now, biological markers of responsiveness are a research question, not a test you can take.

Does a low score mean hypnosis will not help?

Not necessarily. The same review describes landmark studies by Spanos and colleagues in which hypnosis outperformed placebo, topical salicylic acid and no treatment for warts on the hands and feet. Participants who received hypnotic suggestions, such as imagining the wart dissolving, showed significantly greater wart loss than controls, independent of their baseline hypnotizability.

One set of findings on one condition does not generalize to everything. It does suggest that responsiveness on a lab scale and benefit from treatment are not the same question, and that a modest responder should not rule hypnosis out on that basis alone.

Why does the problem you bring matter?

Because the evidence for hypnosis differs sharply from one condition to another. The National Center for Complementary and Integrative Health says there is evidence that gut-directed hypnotherapy can help relieve symptoms and improve quality of life in irritable bowel syndrome, while studies of hypnosis for quitting smoking “have had conflicting results.”

That means a medium responder working on a well-studied problem may have better grounds for trying hypnosis than a high responder hoping it will solve a problem the research has not settled.

How do you find out whether it works for you?

Give it a fair, structured trial rather than judging from one session:

  1. Name the change you want in terms you can count or rate, before you start.
  2. Plan for several sessions. Therapeutic suggestions are often repeated across multiple sessions before they reach their full effect, according to hypnotherapist Deirdre Barrett.
  3. Review progress against your measure, not against how vivid the sessions felt.
  4. Ask what happens if it is not working, including whether the practitioner will suggest another approach.

A warning about guarantees

Be wary of anyone who promises that hypnosis works for everyone, or who treats a lack of response as your failure to “let go.” The research describes real and lasting differences between people. A trustworthy practitioner will tell you that up front, help you test whether hypnosis is moving your measure, and point you elsewhere if it is not.

This article is general information, not medical or psychological advice; talk with a licensed clinician about your own situation.

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