The "Four Humors" is an ancient medical concept that suggests human health and temperament are influenced by four bodily fluids: blood, phlegm, yellow bile, and black bile. Each humor is associated with specific personality traits and physical conditions. For example, an excess of blood is thought to make a person cheerful and sociable, while too much black bile may lead to melancholy. This theory originated in ancient Greece, primarily attributed to the physician Hippocrates and later expanded by Galen. Although it has been largely discredited in modern medicine, the idea of balancing these humors influenced medical practices and theories for centuries, shaping early understandings of health and disease.