The inner life
Nocebo Effect
Direct answer
Nocebo Effect: The nocebo effect is harm that follows from expecting harm: real symptoms brought on by a warning, a belief or a fear, with no physical cause to account for them.
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At a glance
- Also called
- nocebo response, opposite of placebo, voodoo death
- Found in
- Consciousness & Spiritual Psychology
- Related
- Evil Eye, Curse, Curse Tablet, Sympathetic Magic
The nocebo effect is harm that follows from expecting harm: real symptoms brought on by a warning, a belief or a fear, with no physical cause to account for them.
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What is the nocebo effect?
Nocebo is Latin for I shall harm. The word names the measured tendency of people to feel worse when they expect to. In drug trials, volunteers who take an inert pill and are told of possible side effects often report those very effects, and some leave the trial because of them. Pain, nausea, itching and tiredness are the most easily produced.
The idea bears on the old fear of curses. A person who believes harm has been sent watches for it, sleeps badly and reads each mishap as proof. The distress is real and so are its effects on the body, whether or not anything was sent. Walter Cannon made the argument in 1942, in a paper on what he called voodoo death.
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What sets Nocebo Effect apart
The effect is produced by information alone, which makes it unusual among causes of illness. The same inert tablet brings different complaints depending on what the taker was told to expect, and the complaints fade from the reports when the warning is withdrawn. Brain imaging shows that expected pain engages the same regions as pain from a physical source. Researchers therefore count the wording of a warning, from a doctor or from anyone else, as something that can itself do harm.
- Word: Latin nocebo, I shall harm; modelled on placebo, I shall please
- Introduced by: Walter Kennedy, 1961
- Earlier argument: Walter Cannon, 'Voodoo' Death, American Anthropologist, 1942
- Easiest to produce: pain, nausea, itching, headache and fatigue
- In drug trials: people on inert pills report the side effects they were warned about
- Chemical link: the hormone cholecystokinin, in experiments on expected pain
Often mistaken for something else: A placebo response is feeling better because relief is expected; a nocebo response is feeling worse because harm is expected, by the same route.
The story behind Nocebo Effect
The term was introduced by Walter Kennedy in 1961 as the counterpart of placebo, Latin for I shall please. Cannon had argued in 1942 that extreme fear could kill through the body's own stress response. From the 1990s researchers such as Fabrizio Benedetti showed in experiments that a spoken warning can increase pain, and traced part of the effect to anxiety and to the hormone cholecystokinin.
Why Nocebo Effect matters
Nocebo Effect gives a tested, bodily account of how a curse can hurt someone who believes in it, without anything unseen having to act.
How to read Nocebo Effect
Readers bring it to a fear of curses or bad omens: it moves the question from what was sent to what the fear itself is doing, which can be eased.
Nocebo Effect in practice: an example
A patient told that a harmless cream may sting is more likely to feel it sting. A person told that a curse is on them is more likely to fall ill with worry.
Where readings of Nocebo Effect go wrong
Nocebo Effect does not mean that symptoms are imagined or are anyone's fault. Symptoms that last need a doctor, whatever their cause.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- nocebo, nocebo effect meaning, nocebo response, opposite of placebo, voodoo death
- Last updated
- 2026-09-26
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Common questions
What is the nocebo effect?
It is harm produced by the expectation of harm. People who are warned that something may hurt or sicken them often develop real symptoms, even when the thing itself is inert.
Is the nocebo effect the opposite of the placebo effect?
Yes, in that both come from expectation. A placebo response is improvement that follows from expecting to get better; a nocebo response is worsening that follows from expecting to get worse.
Can fear of a curse make a person ill?
Fear can disturb sleep, appetite, heart rate and mood, and people under it often neglect themselves. That is harm from the fear, not evidence of the curse, and it eases as the fear does.
