AI Summary
5 min readIn 2007, New Zealand’s government was baffled. A widely used hormone replacement drug called Eltroxin, which had been on the market for decades with a spotless safety record, suddenly seemed to be making people sick. Reports of adverse side effects skyrocketed—two thousand times higher than normal within eighteen months. The only thing that had changed about the drug was its appearance: the pill’s shape and color had been altered. The active ingredient was identical. The outbreak wasn’t caused by the drug. It was caused by what people believed about the drug, a belief amplified by media coverage. This is the strange, slippery world of collective hysteria—or, as researchers now prefer to call it, mass psychogenic disorder.
What Mass Psychogenic Disorder Actually Is
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What you'll learn
- 1 What is Collective Hysteria? - Stuff You Should Know
- 2 (04:00) **What is Mass Psychogenic Disorder?** - Josh and Chuck introduce the episode's topic, explaining why they prefer "mass psychogenic disorder" over "collective hysteria" due to the gendered connotations of "hysteria."
- 3 (06:12) **The Mexico Boarding School Outbreak** - A contemporary case from Chalco, Mexico, at a girls' boarding school where 600 out of 3,600 students developed vomiting, trouble walking, fever, and nausea.
- 4 (08:26) **Historical Cases and the Gender Question** - Josh and Chuck survey documented outbreaks dating back to the 14th century, including Medieval Dancing Mania and the Salem witchcraft trials.
- 5 (11:35) **The Diagnostic Danger** - Doctors face a serious dilemma: dismissing an outbreak as "all in your head" could miss a real environmental toxin, but running excessive tests can fuel the panic and confirm people's fears.
- 6 (13:15) **Risk Factors and a Famous Tennessee Case** - The condition is more prevalent in isolated communities with rigid, formalized structures, and it often spreads from a top-down influence — a teacher or older student gets sick first, then younger students follow.
- 7 (16:12) **The Nocebo Effect Explained** - Josh and Chuck connect mass psychogenic disorder to the nocebo effect (Latin for "I shall harm"), the negative counterpart of the placebo effect.
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Show Notes
Throughout the history of the world, there have been many cases of what is known as collective hysteria - groups of people, usually young women, who all exhibit the same physical symptoms of non-existent conditions. Is it psychosomatic? Is it group think?
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