Previously, diseases were defined as collections of symptoms; “fever” or “pains” were disease categories in their own right. As historian of medicine Charles Rosenberg writes, “Recognizably modern notions of specific, mechanism-based ailments with characteristic clinical courses were a product of the nineteenth century.” This transformation led to an important change in the way medicine thought about symptoms. Before, doctors had no choice but to take patients at their word about what they were experiencing in their bodies; after all, without any tools to see within the body and without the
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