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In the early history of Western medicine, mental and emotional disturbances, including phobias, were often viewed through a physiological lens, with causes linked to physical imbalances. Hippocrates (460–370 BCE), the father of medicine, proposed that mental health issues were caused by imbalances in the four humors (blood, phlegm, yellow bile, and black bile), and emotional conditions like fear were incorrectly seen as physical symptoms of these imbalances. Galen, a Roman physician, expanded this idea, attributing mental disturbances to bodily humors and brain function.[citation needed]