The Dancing Plague of 1518: When Hundreds of People Danced Until They Died — And Nobody Could Stop Them

 

The Dancing Plague of 1518: When Hundreds of People Danced Until They Died — And Nobody Could Stop Them

In July 1518 in the city of Strasbourg — in what is now northeastern France — a woman named Frau Troffea walked into the street and began to dance.

She danced through the afternoon. She danced through the evening. She danced through the night.

She did not stop.

By the end of the first week approximately thirty people had joined her. By the end of the month the number had grown to four hundred. They danced in the streets, in the public squares, in the halls that the city authorities opened specifically to accommodate them. They danced with bleeding feet. They danced with exhaustion visible in every movement. Some of them collapsed and had to be carried away. Some of them died — from heart attacks, from stroke, from sheer physical exhaustion.

And they could not stop.

The Dancing Plague of 1518 is one of the most thoroughly documented and most completely inexplicable events in medieval history. It lasted approximately two months. It affected hundreds of people. It killed an unknown number — estimates range from dozens to over a hundred.

And after five centuries of examination by historians, physicians, psychologists, and scientists the question of what actually caused it has still not been definitively answered.

Frau Troffea and the Beginning

The historical record of the Dancing Plague of 1518 is unusually detailed for a medieval event — partly because Strasbourg was a prosperous and literate city with functioning civic institutions that kept records, and partly because what was happening was so extraordinary that contemporaries knew they were witnessing something worth documenting.

The outbreak began in mid-July 1518 when a woman identified in the records as Frau Troffea — her first name is not recorded — stepped into a narrow street in Strasbourg and began to dance. She danced silently — no music was playing. She danced without apparent joy or distress, simply moving compulsively and continuously.

Her husband reportedly tried to stop her. He could not. He sought help from the city authorities. They were baffled.

After four to six days of continuous dancing Frau Troffea was taken to the shrine of Saint Vitus — a patron saint associated in medieval tradition with the affliction that caused involuntary movement — in the hope that a religious cure might work. The records suggest she recovered, at least temporarily.

But the dancing had already spread.

Within days others in the neighborhood began dancing. Then more. The phenomenon spread through the city with a speed and consistency that made clear this was not a performance or a festival or a deliberate act. These people were compelled. They danced against their will, in pain, unable to stop despite obvious physical distress.

The Extraordinary Decision of the Authorities

When the Strasbourg city council and the local physicians consulted on what to do about the dancing they made a decision that seems baffling to modern observers but made complete sense within their medical framework.

The physicians diagnosed the condition as hot blood — an excess of natural heat in the body — and recommended that the best treatment was to allow the dancing to continue and burn itself out. Stopping the dancers forcibly, they argued, might worsen the condition.

The city council therefore did something remarkable. They cleared public halls — the guildhall and the grain market — for the dancers to use. They hired musicians to play for them. They brought in professional dancers to join and support them. They apparently believed that providing a better environment for the dancing would help it resolve more quickly.

The result was the opposite of what they intended. The music and the space and the additional dancers appear to have amplified rather than resolved the outbreak. More people joined. The dancing intensified.

Contemporary accounts describe the dancers moving day and night without significant rest — their feet bleeding through their shoes, their faces contorted with what observers described as a mixture of agony and compulsion, calling out to saints or crying or simply staring blankly while their bodies kept moving.

Some fell to the ground and had to be revived before they continued. Some lost consciousness entirely. Some did not revive.

The death toll from the Dancing Plague of 1518 is difficult to establish precisely from the surviving records — figures of fifteen deaths per day were mentioned in some contemporary accounts though historians consider this likely an exaggeration. What is certain is that people died from the physical consequences of sustained uncontrollable movement — heart failure, stroke, and exhaustion.

Where It Ended

After approximately two months the outbreak began to subside. The dancers — those who had survived — were transported to the shrine of Saint Vitus at Saverne, approximately thirty kilometers from Strasbourg. There they were given red shoes blessed by a priest and participated in religious ceremonies. The dancing gradually ceased.

The city authorities banned dancing and music in public spaces for the duration of the summer — an attempt to prevent recurrence.

The Dancing Plague of 1518 did not recur in Strasbourg. But similar outbreaks had been recorded elsewhere in Europe in previous centuries — in Erfurt in 1237, in Aachen in 1374, in various locations along the Rhine valley — suggesting that whatever caused the Strasbourg outbreak was not entirely unique to that time and place.

What Modern Science Says

The Dancing Plague of 1518 has attracted sustained scientific and historical attention precisely because it is so thoroughly documented and so completely strange. Several explanations have been proposed. None has achieved universal acceptance.

The first and most commonly cited explanation is mass psychogenic illness — what was formerly called mass hysteria. This is a well-documented phenomenon in which psychological stress produces genuine physical symptoms that spread through a community through social contagion — one person's symptoms triggering the same symptoms in others through a combination of anxiety, suggestion, and the body's genuine physical response to extreme psychological stress.

The historian John Waller — who has studied the Dancing Plague more thoroughly than any other modern scholar — argues persuasively for this explanation. He points to the specific conditions in Strasbourg in 1518 as creating ideal conditions for mass psychogenic illness. The city had experienced years of severe hardship — famine, disease, political instability, and floods had created a population under extraordinary sustained stress. The religious culture of the time included genuine belief in Saint Vitus as a figure who could curse people with involuntary dancing — a belief framework that Waller argues may have provided the psychological template through which the stress expressed itself physically.

In this explanation the dancing was real — the physical symptoms were genuine and the deaths were genuine — but the cause was psychological rather than biological. The body can produce extraordinary physical manifestations under sufficient psychological stress and those manifestations can spread through a community that shares the same fears, beliefs, and stressors.

The second explanation is ergot poisoning — a condition caused by a fungus called Claviceps purpurea that grows on rye and other grains, particularly in wet conditions. Ergot poisoning produces powerful effects including convulsions, hallucinations, and involuntary muscle movements. Outbreaks of ergot poisoning — known historically as St. Anthony's Fire — were documented in medieval Europe.

The problem with the ergot explanation for the 1518 outbreak is specificity. Ergot poisoning would be expected to affect everyone who consumed contaminated grain — not to spread selectively through a community the way the dancing appears to have done. And the symptoms of ergot poisoning, while dramatic, do not precisely match the continuous directed movement described in the Dancing Plague accounts.

The third explanation — proposed less frequently — is simply that the dancing was a form of religious ritual or protest that got out of hand and was misinterpreted by observers and authorities. This explanation struggles to account for the evident distress of the dancers and the deaths that occurred.

The honest answer is that the Dancing Plague of 1518 has not been definitively explained. The mass psychogenic illness theory is the most scientifically coherent and historically contextualised explanation available — but it is not proven.

Other Dancing Plagues

Strasbourg 1518 is the most thoroughly documented outbreak but it was not the only one.

In Erfurt in 1237 a group of children reportedly danced uncontrollably from that city to Arnstadt — a distance of approximately twenty kilometers. Many collapsed on the way and some reportedly died.

In 1374 a mass dancing outbreak occurred in multiple cities along the Rhine — Aachen, Cologne, Metz, and others — affecting thousands of people over several months. This outbreak was particularly associated with the aftermath of the Black Death, which had devastated the region's population and created the kind of sustained psychological trauma that modern researchers associate with mass psychogenic illness.

The pattern across these outbreaks is consistent — they occur in populations under severe sustained stress, they spread through communities rather than affecting isolated individuals, and they tend to resolve through religious intervention even when they do not respond to medical treatment. This pattern is consistent with mass psychogenic illness but does not definitively prove it.

Why This Story Matters

The Dancing Plague of 1518 is not simply a bizarre footnote in medieval history. It is a window into something genuinely important about human psychology and the relationship between mind and body.

The people of Strasbourg who danced until their feet bled and some of them died were not performing, not faking, not choosing what was happening to them. Their suffering was real. The physical symptoms were real. The deaths were real.

What produced those symptoms was not a microbe or a toxin that can be identified and treated. It was — most likely — the accumulated weight of human suffering, fear, and desperation expressing itself through the only outlet available in a culture that had no other framework for processing that kind of collective psychological devastation.

The modern world has its own forms of mass psychogenic illness — documented outbreaks continue to occur in schools, communities, and workplaces around the world. The mechanisms are better understood now than they were in 1518. The underlying human vulnerability they reveal is unchanged.

We are social creatures who share not only language and culture but fear, stress, and the physical consequences of both. Under sufficient pressure those shared vulnerabilities can produce shared symptoms — and sometimes those symptoms can kill.

Frau Troffea danced into the street in July 1518 and could not stop.

Five hundred years later we still do not fully understand why.

And that — the genuine mystery at the heart of a completely documented historical event — is perhaps the most unsettling thing about the Dancing Plague of 1518.

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