The fascinating—and often secret—history of the body's most fascinating system: the gut. The stomach is notoriously outspoken. It growls, gurgles, and grumbles while other organs remain silent, inconspicuous, and content. For centuries humans have puzzled over this rowdy organ, deliberating on the extent of its influence over cognition, mental wellbeing, and emotions, and wondering how the gut became so central to our sense of self. Traveling from ancient Greece to Victorian England, eighteenth-century France to modern America, historian Elsa Richardson leads us on a tour of the gut, exploring all the ways that we have imagined, theorized, and probed the mysteries of the gastroenterological system. We'll meet a diverse cast of characters including Edwardian body builders, hunger-striking suffragettes, demons, medieval alchemists, and one poor teenage girl plagued by a remarkably vocal gut, all united by this singular organ. Engaging, eye-opening, and thought-provoking, Rumbles leaves no stone unturned, scrutinizing religious tracts and etiquette guides, satirical cartoons and political pamphlets, in its quest to answer the millennia-old question: Are we really ruled by our stomachs?