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Mind

From headaches to tics, how mass nocebo effects spread real symptoms

Social media is enabling health symptoms and mass psychogenic illnesses to spread quickly around the world. But by knowing how it happens, you can protect yourself

By David Robson

17 February 2025

×îÐÂÂé¶¹ÊÓÆµ. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Deena So Oteh

Centuries ago, witches and shamans would mutter curses with the intention of spreading illness. Today, certain social media feeds may serve the same purpose.

We aren’t talking about sharing dubious claims about quack treatments and fad diets, but rather information that exaggerates threats to our health. Through the power of suggestion, these posts can trigger real symptoms – ranging from Tourette’s-like tics to headaches, muscle pain, fainting fits and even cognitive impairment.

That negative expectations can influence our health is already well established – it is called the “nocebo effect” and there is increasing interest in how it can pass from…

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