In the middle of July 1518, in the city of Strasbourg — then part of the Holy Roman Empire, now in modern France — a woman named Frau Troffea stepped out of her house and into the narrow cobblestone street. She began to dance. There was no music. No festival. No celebration. She simply began to move — twitching, swaying, spinning — as if possessed by a rhythm only she could hear. Her husband begged her to stop. Her neighbors gathered to watch. She danced through the day. She danced through the night. By the third day, she had not slept. Her feet were bleeding. Her eyes were wild. She could not stop. And then, something even stranger happened: other people began to join her. Within a week, 30 people were dancing in the streets of Strasbourg. Within a month, the number had swelled to over 400. They danced without ceasing — day and night, in the blazing summer heat, their feet torn and bleeding, their bodies wracked with exhaustion. Some collapsed from strokes. Some died of heart attacks. Some simply stopped moving and were dead before they hit the ground. The Dancing Plague of 1518 — the most famous and terrifying case of choreomania in history — would last for nearly two months. By the time it ended, at least 15 people a day were dying. And no one — not the physicians, not the priests, not the city council — could figure out what was causing it.
Summary: The Dancing Plague of 1518 was a mass outbreak of choreomania — uncontrollable, compulsive dancing — that occurred in Strasbourg between July and September 1518. It began with a single woman, Frau Troffea, and spread to as many as 400 participants. The dancers appeared to be in a trance-like state, unable to stop despite exhaustion, injury, and pleas from authorities. Contemporary physicians diagnosed the cause as "hot blood" — a humoral imbalance — and recommended that the dancers continue dancing until the illness passed. City authorities set up a stage and hired musicians, believing that the dancers would exhaust themselves and recover. Instead, the dancing intensified. At least 15 people died per day at the peak of the plague. The cause remains unknown. Theories include mass psychogenic illness, ergot poisoning (from a hallucinogenic mold that grows on rye), religious mania, and a stress response to famine and disease.
🏰 The City: Strasbourg in 1518
Strasbourg in 1518 was a city on the edge. Famine had swept through the region for years. The harvests had failed. Grain prices had skyrocketed. People were starving. Disease was rampant — syphilis, smallpox, leprosy. The summer of 1518 was brutally hot. The air was thick, the rivers were low, and the city's poor — crammed into squalid housing with no sanitation — were suffering. The psychological atmosphere was apocalyptic. The Church preached that the end times were near. Astrologers had predicted a great catastrophe. The citizens of Strasbourg were already dancing with death when Frau Troffea began to dance in the street. The city's response was shaped by medieval medical theory. The physicians of the time believed in the four humors: blood, phlegm, yellow bile, and black bile. Illness was caused by an imbalance of the humors. The physicians diagnosed the dancers with "hot blood" — an excess of heat that needed to be released. Their prescription: more dancing. The city council, following medical advice, took a disastrous step. They cleared a public marketplace. They built a wooden stage. They hired musicians — drummers, pipers — to play for the dancers. They believed that if the dancers could be encouraged to dance continuously, they would eventually exhaust the "hot blood" and recover. The opposite happened. More dancers joined. The death toll mounted.
🔬 The Theories: What Made Them Dance?
Modern science has proposed several theories for the Dancing Plague of 1518. The most widely accepted is mass psychogenic illness — what used to be called "mass hysteria." In conditions of extreme stress — famine, disease, social upheaval — groups of people can develop physical symptoms without an organic cause. The dancing was a collective trance state, a dissociative fugue triggered by the unbearable pressures of life in Strasbourg in 1518. The dancers were not pretending. Their bodies were moving involuntarily. They were trapped in a psychological loop — a waking nightmare from which they could not escape. Another theory is ergotism — poisoning from ergot, a hallucinogenic mold that grows on rye and other grains. Ergot contains alkaloids similar to LSD. It can cause convulsions, hallucinations, and a sensation of burning heat. Entire villages in medieval Europe were known to have experienced ergot poisoning after eating contaminated bread. But ergotism typically causes a restriction of blood flow — making movement difficult — which contradicts the compulsive dancing. A third theory is encephalitis — inflammation of the brain caused by infection. Certain viral infections can cause movement disorders, including chorea (involuntary jerking movements) and compulsive behavior. But the scale of the outbreak — 400 people — makes a viral cause unlikely. The Dancing Plague remains, in the end, an enigma — a moment when the boundary between mind and body, between individual and collective, dissolved into something terrible and strange.
"They danced in the streets. They danced in the fields. They danced on the stage the city built for them. And when they fell, they did not rise again."
🙏 The Cure: Saint Vitus and the Shrine of Exorcism
After weeks of failed medical interventions, the city council finally turned to religion. The dancers were gathered together and marched — still dancing, still twitching — to the shrine of Saint Vitus, located in a cave near the village of Saverne, about 30 miles from Strasbourg. Saint Vitus was the patron saint of dancers and epileptics. The legend held that those afflicted with "Saint Vitus' Dance" — a term used to describe various movement disorders — could be cured by praying at his shrine. At the shrine, the dancers were given red shoes and had crosses painted on their hands. Priests performed exorcisms. Holy water was sprinkled. The dancers danced. And then, gradually, they stopped. Over the course of several weeks, the dancing subsided. The survivors — those who had not died of exhaustion, stroke, or heart failure — returned to their homes. The plague ended. No one knew why it had started. No one knew why it had stopped. The Dancing Plague of 1518 was not the only outbreak of choreomania in medieval Europe. Similar plagues occurred in Aachen in 1374, in Cologne in 1381, and in multiple German towns throughout the 14th and 15th centuries. But Strasbourg's was the largest, the best documented, and the most deadly. It remains, to this day, the strangest epidemic in human history — not a disease of the body, but a sickness of the collective soul.
The Red Shoes: A Symbol of Collective Madness
"The image of the dancers wearing red shoes — given to them by the priests at Saint Vitus's shrine — has become one of the enduring symbols of the Dancing Plague. The shoes were meant to be a cure: the color red was associated with Saint Vitus, and the shoes were blessed by the priests. But they also became a mark — a scarlet letter of hysteria. The dancers in their red shoes, moving in unison, their feet bleeding through the leather, their eyes unfocused on some invisible horizon — they were a vision of humanity reduced to its most primal state. The Dancing Plague of 1518 has inspired artists, writers, and filmmakers for centuries. It is the subject of songs, novels, and academic treatises. It is referenced in discussions of mass psychology, neuroscience, and the sociology of belief. It is a reminder that the line between the individual and the crowd is thin — that under certain conditions, our bodies can betray us, our minds can dissolve into the collective, and we can find ourselves dancing to a rhythm we cannot hear. The red shoes are still there, in the historical record, waiting for someone to put them on."