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There is an “anxiety variant” in which abdominal pain, headache, dizziness, fainting, nausea, and hyperventilation are the most common symptoms, and there is a “motor variant” in which the most common symptoms are “hysterical dancing, convulsions, laughing, and pseudoseizures.” These “dancing plagues,” as they are called by historians, occasionally swept through medieval European villages, leading some townspeople to dance until they died from exhaustion.[57]
