“It’s just a placebo.” It is the commonest dismissal of hypnosis, and it is usually meant as the end of the discussion. For one of the field’s leading researchers, it was the beginning of a more interesting one.
What a placebo is
A placebo is a treatment with no active ingredient that still produces a real effect because the person expects one. Placebo effects are well documented, particularly for pain, nausea, mood and fatigue. They are not imaginary: they involve measurable changes in the brain and body.
The key driver is expectation. If you expect to feel better, you often do.
Kirsch’s idea
The psychologist Irving Kirsch has spent a career studying both placebos and hypnosis. He proposed that the two work through the same mechanism, which he called response expectancy: what you expect to experience automatically shapes what you do experience.
On this view, a hypnotic induction contains no special ingredient. What it does is create a setting in which people expect unusual things to happen to them, and therefore they do. Kirsch described clinical hypnosis as a nondeceptive placebo.
That last phrase is the important one. An ordinary placebo requires deception: the sugar pill must be presented as medicine. Hypnosis does not. The practitioner says openly, “I am going to make suggestions and your mind will respond to them,” and the effect occurs anyway.
Evidence that expectation matters
The label helps. In one trial, people with public speaking anxiety received either cognitive behavioural therapy or the same therapy with relaxation relabelled as hypnosis and suggestions added. The hypnosis group improved more. They had also expected to improve more, and those expectations were linked to how well they did.
Adding hypnosis boosts therapy. A meta-analysis of 18 studies found that the average client receiving cognitive behavioural therapy with hypnosis did better than at least 70 per cent of those receiving the same therapy without it.
Expectation predicts response. People who expect to respond to hypnosis tend to respond more.
But it is not only expectation
Three things suggest hypnosis is more than a standard placebo:
- Hypnotizability is a stable trait. Responsiveness to hypnosis is consistent over decades, and it does not line up neatly with responsiveness to placebo pills.
- Suggestions are specific. A placebo pill produces a general effect. A hypnotic suggestion can be aimed at one hand, one sensation, or one aspect of pain. Imaging studies show that suggestions about how intense a pain is, and how unpleasant it is, change activity in different brain areas.
- Hypnosis has outperformed placebo. In some laboratory pain studies, highly hypnotizable people got more relief from hypnotic suggestion than from a placebo.
The debate between researchers who think hypnosis involves a special state and those who think it is expectation and social context has run for decades and is not settled.
Why this is good news
If expectation is a large part of how hypnosis works, several practical points follow.
- You can use it openly. No trickery is needed.
- It is safe and cheap.
- Your attitude matters. Going in hopeful and willing improves your results.
- The practitioner matters. Confidence, warmth and a clear explanation help.
- Rituals are not silly. The induction, the quiet room and the calm voice build the expectation that does the work.
The limits
Expectation changes experience: pain, anxiety, nausea, sleep, cravings. It does not shrink tumours, mend bones or kill infections. Hypnosis belongs alongside medical treatment for conditions like those, not in place of it.
The bottom line
Calling hypnosis a placebo is not the insult it sounds like. It may be the most honest and controllable way we have of putting the mind’s own expectations to work.
Next in the series: Hypnosis for Hot Flushes: A Proven Non-Hormonal Option for Menopause
This article is for general information and is not medical advice.