It may have origins in ancient Egypt or Mesopotamia, but it was the Greek physician Hippocrates (460–370 BC) who developed it into a medical theory. He believed certain human moods, emotions and behaviors were caused by an excess or lack of body fluids (called "humors"): blood, yellow bile, black bile, and phlegm.
Herein, what are the four humours and what are they associated with?
The four humors are black bile, yellow bile, phlegm, and blood. This theory was closely related to the theory of the four elements: earth, fire, water, and air; earth predominantly present in the black bile, fire in the yellow bile, water in the phlegm, and all four elements present in the blood.
What are the four personality types?
The Four temperament theory is a proto-psychological theory that suggests that there are four fundamental personality types: sanguine, choleric, melancholic, and phlegmatic.
What is choleric humor?
Blood, or the Sanguine humor, is the red, hemoglobin-rich portion. Phlegm, or the Phlegmatic humor, is present as the clear plasma portion. Yellow Bile, or the Choleric humor, is present as a slight residue or bilirubin, imparting a slight yellowish tint.