The cardinal fluids are blood, yellow bile, black bile, and phlegm. Each humor is associated with a different organ and season. Black bile is associated with the spleen and Autumn, yellow bile with the liver and Summer, phlegm with the brain and Winter, and blood with the heart and Spring. In addition, every human possess two primary opposite qualities: hot, dry, moist, or cold. An individual’s temperament can be distinguished by which humor they are. These fluids are meant to have a natural balance that is unique to each person and keeps humans healthy. If the balance is disturbed, illness occurs. Hippocratic physicians believed these balances could be restored by removing or adding humors (Carthledge, 314; Bockler 106).
This particular theory dates back before Greek times, but Hippocrates reworked it into what is now known as the Hippocratic humoral theory. Hippocrates of Cos was a physician who lived between 460-380 BCE. He has multiple textual works accredited to him although there is no evidence he wrote them. These works include the Hippocratic Corpus and the Hippocratic Oath (L. Adkins and R. Adkins