A Nocebo is the opposite of a Placebo →
https://quillette.com/2024/03/11/the-placebo-effects-evil-twin

The most powerful drug or treatment ever invented is the Placebo, so to learn of its evil twin was a thrill. Expectations in humans are some of the greatest moments we have, so of course there is a dark side to them. Time-traveling can be fun when you’re thinking about your vacation in a week; not so much when you’re thinking about surgery.
Discussion on the Havana Syndrome appears at the end of the article, and, as always, no conclusions are reached about it. It’s a fascinating topic in that it’s still a mystery after all these years. A good reminder that science can be slow.

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