What is Mass hysteria?
[[File:Dance at Molenbeek.jpg|thumb|269x269px|[[Dancing plague of 1518|Dancing plagues]] of the [[Middle Ages]] are thought to have been caused by mass hysteria]] '''Mass hysteria''' or '''mass psychological illness''' is a phenomenon when a large group of people share a common [[emotion]]. This emotion can be positive, such as people being [[Euphoria|euphoric]] at a rock concert, or it can be negative, like after a great person or statesman died. It was first used by the Quarteerly Christian Spectator in 1830, to describe an outbreak of [[cholera]].<ref>The Journal of Health Conducted by an Association of Physicians (1831) p. 180</ref> == References == {{reflist}} [[Category:Symptoms]] [[Category:Psychology]] [[Category:Human behavior]] {{biology-stub}}