Dancing mania

Dancing mania (also known as dancing plague, choreomania, St John's Dance and, historically, St. Vitus's Dance) was a social phenomenon that occurred primarily in mainland Europe between the 14th and 17th centuries. It involved groups of people dancing erratically, sometimes thousands at a time. The mania affected men, women, and children who danced until they collapsed from exhaustion. One of the first major outbreaks was in Aachen, in the Holy Roman Empire, in 1374, and it quickly spread throughout Europe; one particularly notable outbreak occurred in Strasbourg in 1518, also in the Holy Roman Empire.

Affecting thousands of people across several centuries, dancing mania was not an isolated event, and was well documented in contemporary reports. It was nevertheless poorly understood, and remedies were based on guesswork. Generally, musicians accompanied dancers, to help ward off the mania, but this tactic sometimes backfired by encouraging more to join in. There is no consensus among modern-day scholars as to the cause of dancing mania.

The several theories proposed range from religious cults being behind the processions to people dancing to relieve themselves of stress and put the poverty of the period out of their minds. It is, however, thought to have been a mass psychogenic illness in which the occurrence of similar physical symptoms, with no known physical cause, affect a large group of people as a form of social influence.

"Dancing mania" is derived from the term "choreomania", from the Greek choros (dance) and mania (madness), and is also known as "dancing plague". The term was coined by Paracelsus, and the condition was initially considered a curse sent by a saint, usually St. John the Baptist or St. Vitus, and was therefore known as "St. Vitus's Dance" or "St. John's Dance". Victims of dancing mania often ended their processions at places dedicated to that saint, who was prayed to in an effort to end the dancing; incidents often broke out around the time of the feast of St Vitus.

St Vitus's Dance was diagnosed, in the 17th century, as Sydenham chorea. Dancing mania has also been known as epidemic chorea and epidemic dancing. A disease of the nervous system, chorea is characterized by symptoms resembling those of dancing mania, which has also rather unconvincingly been considered a form of epilepsy. Scientists have described dancing mania as a "collective mental disorder", "collective hysterical disorder", and "mass madness".

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