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    Research overview

    Clinical Hypnosis: What the Research Says

    These sources reflect the broader clinical hypnosis research base, not studies of Boulder Hypnotherapy Institute's courses or a guarantee of results from any particular practitioner. Individual results vary. Findings depend on the condition, the person, and how hypnosis is used. Below, we separate professional recognition from treatment research and explain both the findings and their limits.

    A careful reading

    What the evidence can—and cannot—tell us

    Professional context

    Professional recognition

    The finding

    Hypnosis has an established place in professional psychology. APA Division 30—the Society of Psychological Hypnosis, part of the American Psychological Association—works to establish clinical hypnosis as a certifiable professional proficiency. In 2014, its Executive Committee published an official definition of hypnotherapy: “The use of hypnosis in the treatment of a medical or psychological disorder or concern.”

    What this means

    There is a professional community developing standards, education, and research around hypnosis. This recognition is not an APA endorsement of our school or proof that hypnosis works for every concern.

    Sources

    Systematic reviews and meta-analysis

    Pain relief

    The finding

    A meta-analysis of 85 controlled trials involving 3,632 participants found moderate-to-large pain-relieving effects from hypnosis (standardized effect size 0.54 to 0.76, statistically significant). Highly suggestible participants given direct pain-relief suggestions under hypnosis experienced a 42% reduction in pain—a clinically meaningful reduction. These were studies of experimentally induced pain in healthy participants, not evidence that every patient with chronic pain will experience that reduction.

    What this means

    Hypnosis can change how some people experience pain. An effect size describes the difference between groups; it is not a percentage of patients helped. The 42% finding applies to a specific highly suggestible group, not everyone.

    Important context

    A newer 2026 systematic review in the European Journal of Pain also found pain-relieving benefits, but its conclusions about clinical pain were more cautious: reductions were modest, and hypnosis did not clearly outperform relaxation, pain education, or cognitive-behavioural therapy. It may be supportive care for selected people, not a reliably superior treatment.

    Sources

    Randomized trials and clinical experience

    IBS (irritable bowel syndrome)

    The finding

    Häuser's 2024 review describes gut-directed hypnotherapy across 8 randomized controlled trials involving 464 patients. Compared with controls, the relative risk of symptom relief was 1.69 short-term (number needed to treat: 5) and 2.17 long-term (number needed to treat: 3). In a separate large clinical series of 1,000 patients who had not responded to standard medical treatment, 75% achieved a clinical response.

    What this means

    In the controlled trials, people receiving gut-directed hypnotherapy were more likely to report relief. A number needed to treat of 5 means about one additional person benefited for every 5 treated compared with the control—not that only one in five improved. The long-term figure was 3.

    Important context

    Gut-directed hypnotherapy is a specific approach for IBS. A clinical response means meaningful improvement, not necessarily a cure. The 1,000-patient series was not a randomized comparison, so its 75% response rate should not be treated as a guaranteed success rate.

    Sources

    Umbrella review

    The broader evidence base

    The finding

    A 2024 umbrella review by Rosendahl, Alldredge & Haddenhorst brought together 49 separate meta-analyses of hypnosis across many health conditions. Reported effect sizes ranged from -0.04 to 2.72, with about a quarter showing medium effects and nearly 29% showing large effects.

    What this means

    An umbrella review looks across reviews rather than at just one study. These findings suggest meaningful benefits in some settings, but the wide range also includes little or no benefit. The percentages describe reported effects—not the proportion of patients who improve.

    Important context

    The authors found considerable overlap in the underlying studies, and only nine meta-analyses were rated high quality. Evidence strength differs by condition; these findings should not be generalized to every use of hypnosis or to regression claims.

    Sources

    A note about care

    This page is educational, not personal medical advice. Hypnosis should not replace appropriate medical assessment or prescribed care. Discuss symptoms and treatment options with a qualified healthcare professional.

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