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mass hysteria

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noun Psychology.
  1. a condition affecting a group of persons, characterized by excitement or anxiety, irrational behavior or beliefs, or inexplicable symptoms of illness.
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Origin of mass hysteria

First recorded in 1930–35
Also called epidemic hysteria.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
mass hysteria in Medicine

mass hysteria

n.
  1. Spontaneous, en masse development of identical physical or emotional symptoms among a group of individuals, as in a classroom of schoolchildren.
  2. A socially contagious frenzy of irrational behavior in a group of people as a reaction to an event.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.