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» Mass hysteria

Mass hysteria is the sociopsychological phenomenon of the manifestation of the same or similar hysterical symptoms by more than one person. A common manifestation of mass hysteria occurs when a group of people believe they are suffering from a similar disease or ailment.

Mass hysteria typically begins when an individual becomes ill or hysterical during a period of stress. After this initial individual shows symptoms, others begin to manifest similar symptoms, typically nausea, muscle weakness, fits or headache.

The features of mass hysteria include no plausible cause found, ambiguous symptoms, rapid escalation of cases - often spread by line of sight - and rapid remission of symptoms. Demographically, cases are higher in females and those with greater use of medical services.

Sightings of religious miracles are often attributed to mass hysteria.

Examples of mass hysteria:

* Dancing mania occurred primarily in mainland Europe between the 14th and 18th centuries; it involved groups of people, sometimes thousands at a time, who danced uncontrollably and bizarrely. Men, women, and children would dance through the streets of towns or cities, sometimes foaming at the mouth until they collapsed from fatigue.
*

“Dennō Senshi Porygon” (a Pokémon episode) aired in Japan on December 16, 1997 at 6:30 PM Japan standard time.

Twenty minutes into the episode, there is a scene in which Pikachu stops some vaccine missiles with its Thunderbolt attack, resulting in a huge explosion that flashes red and blue lights.

At this point, viewers started to complain of blurred vision, headaches, dizziness and nausea. Some experienced seizures, blindness, convulsions and loss of consciousness. Japan’s Fire Defense Agency reported that a total of 685 viewers, 310 boys and 375 girls, were taken to hospitals by ambulances.
Later studies showed that 5-10% of the viewers had mild symptoms that did not need hospital treatment. 12,000 children who did not get sent to hospital by ambulance reported mild symptoms of illness.