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Humoralism is a category for books that explore the premodern theory that health, personality, and even the natural world are governed by the balance of four bodily humors—blood, phlegm, yellow bile, and black bile. It includes classical and medieval medical texts and translations (Hippocratic and Galenic traditions), modern histories and cultural studies tracing the theory’s influence on medicine, diet, psychology, and the arts, and literary criticism of its impact on drama and poetry. The category also features historical fiction and speculative works that use the sanguine, choleric, melancholic, and phlegmatic temperaments to shape characters and worldbuilding. Emphasizing historical context and intellectual legacy rather than contemporary medical guidance, Humoralism illuminates how this framework shaped everyday life and imagination for centuries.

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