noun
a detrimental effect on health produced by psychological or psychosomatic factors such as negative expectations or beliefs
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The patient experienced negative side effects due to the nocebo effect.
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She started feeling worse after reading about the side effects online, it's like a nocebo effect.
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I swear every time I read the side effects on medication, I start feeling them - it's like a nocebo effect or something.
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His fear of failure acted as a nocebo effect, causing him to underperform.