From July to September 1518, the Holy Roman Empire's dancing disease (or dance epidemic) struck Strasbourg, Alsace (modern-day France). Between 50 and 400 people went to the dance floor for days.

2.Stress-induced mass hysteria:

Dancing plague may have been a flourishing example of psychogenic movement disorder in mass hysteria or mass psychogenic disease. The behaviour, caused by the rutheless years (even by the harsh standards of the early modern era), of the Alsat...

The question of whether or not people danced to their deaths has sparked debate. Some sources suggest that the plague killed about fifteen people per day for a period of time. The city of Strasbourg's sources at the time of the events did not record the number of deaths or even if there were fata...