The Dancing Plague of 1518: When an Entire City Danced Itself to Exhaustion
In the summer of 1518, something extraordinary and terrifying began unfolding on the streets of Strasbourg. It started with a single woman, known to history only as Frau Troffea, who stepped into a narrow street and began to dance. But this was no ordinary dance — it was frantic, uncontrollable, and seemingly endless.
For six straight days, Frau Troffea danced until her feet bled and her body was bruised and battered. Authorities eventually intervened, taking her to a holy shrine in hopes of divine intervention. But their troubles were just beginning.
The Contagion Spreads
Within days of Frau Troffea’s removal, 34 more people were seized by the same irrepressible urge to dance. The affliction spread like wildfire through the medieval city, eventually consuming between 50 and 400 people in what became known as the Dancing Plague of 1518.
The dancers moved in ways that witnesses described as wild, frenzied, and otherworldly. They jerked and writhed to music that only they could hear, screaming and crying out in apparent agony, yet unable to stop their relentless movement. Many danced until they collapsed from exhaustion, their bloodied feet no longer able to support their weight.
A Medieval Mystery That Baffled Authorities
The Strasbourg outbreak was not an isolated incident. Similar episodes of dancing mania, known as “choreomania” or “St. John’s dance,” had erupted across medieval Europe for centuries. The worst recorded outbreak occurred in 1374, originating in Aachen, Germany, and spreading rapidly along the Rhine River to towns in Belgium and the Netherlands.
During that epidemic, hundreds of villagers took to the streets, dancing in apparent trances for weeks on end. Contemporary accounts from physicians, monks, and chroniclers provide chilling descriptions of people writhing uncontrollably, some claiming to see visions of demons or saints.
Medieval authorities were at a loss. Initially, they tried to help by providing music, thinking it might ease the dancers’ distress. This backfired spectacularly, as the musical accompaniment only seemed to intensify the dancing frenzy. In desperation, officials banned music entirely and began tying dancers to carts for forced pilgrimages to holy sites.
Theories Behind the Madness
At the time, explanations ranged from demonic possession to “overheated blood.” Today, historians and scientists have proposed several theories, though the true cause remains a mystery.
One hypothesis suggests ergot poisoning. This fungus grows on rye and other grains, containing lysergic acid — the same compound found in LSD. Ergotism can cause hallucinations and convulsions, potentially explaining the dancers’ bizarre behavior. However, this theory falls short when considering that dancing mania occurred in regions with different crops and climates, making widespread ergot contamination unlikely.
The most widely accepted explanation today is mass psychogenic illness, also known as mass hysteria. This phenomenon occurs when psychological distress manifests as physical symptoms that spread through a population, particularly during times of extreme stress.
The Perfect Storm of Medieval Misery
The timing of these dancing plagues supports the mass hysteria theory. The 1374 outbreak followed devastating floods along the Rhine River, with chronicles describing water rising 34 feet and dead horses floating through town streets. Similarly, the decade before the 1518 Strasbourg incident was marked by famine, disease, and widespread suffering.
Crucially, dancing mania only struck communities that believed in such curses. In 1374, victims believed they were cursed by the Devil and desperately sought divine intervention through exorcism. The people of Strasbourg in 1518 believed they were afflicted by Saint Vitus’s curse, and their behavior matched the conventions of that particular legend.
These traumatized, impoverished communities were psychologically primed for epidemic possession. When one person succumbed to the overwhelming stress through uncontrollable dancing, others followed suit, creating a self-reinforcing cycle of collective hysteria.
The End of an Era
The dancing plagues mysteriously disappeared by the mid-17th century, never to return. As medieval superstitions gave way to more rational worldviews, the cultural conditions that enabled such mass hysteria events gradually faded.
The Dancing Plague of 1518 stands as a haunting reminder of humanity’s capacity for collective psychological experiences. In an age when we understand more about the mind than ever before, these medieval episodes continue to fascinate and perplex us — a testament to the enduring mysteries of human behavior under extreme stress.
Perhaps most remarkably, no contemporary sources mention any deaths during the 1518 outbreak, despite later claims that up to 15 people died daily at the epidemic’s peak. The true toll of the dancing plague may have been measured not in lives lost, but in a community’s desperate attempt to cope with overwhelming hardship through one of history’s strangest collective experiences.