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5 Strange Science Takeaways From The Middle Ages’ Deadly Dance Hysteria

Pathology Of The Dance

As David Byrne once said while doing his own dance in the “Once in a Lifetime” music video, “Well … how did I get here?” There is no definite answer to this, but there are sound theories.

Glass Orb in Study II

Michael Dziedzic/Unsplash

Maybe a fortune teller pointed a finger at them and said, “The rhythm is gonna get you tonight.” 

At the time, of course, this was chalked up to demonic possession. Who could blame anyone for guessing this? Those afflicted were said to be in a trance-like state, and many of them cried out for help and were visibly in pain, indicating that the dance was not their choice. While the dancers may not have been the victims of dark magic, keep this pinned to the idea board, as it will be important later on.

One modern theory is that the doomed dancers were suffering from ergotism. Ergot is a type of fungus that grows on rye. Effects of ergot ingestion include hallucinations and tremors, and instances of ergotism in medieval Europe are well documented. While this theory does offer an explanation for why something resembling dancing occurred, it does not explain why the episodes lasted as long as they did. The 1518 dancing plague in Strasbourg may have lasted two months, while ergotism’s effects typically do not.

Detail from the painting Temptation of St Anthony by Matthias Grünewald, showing a patient suffering advanced ergotism.

Matthias Grunewald

It’s so awful though, it might feel like two months. 

A more complex take on the cause of the hysteria comes from John Waller, a medical historian. Waller notes the severe psychological stresses were at play in areas where dancing plagues occurred. Life in the Middle Ages was brutal and short, and this was especially true in the regions and times where dancing outbursts happened. Take Strasbourg in 1518, for example. These were people dealing with poor harvests, which meant even harsher living. Diseases like syphilis were also raging throughout the area. The stress of this eventually broke people like poor Frau Troffea down. 

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