The Four Humors

The Four Humors

Updated Aug 21, 2014 at 10:20PM EDT by Twenty-One.

Added Apr 01, 2013 at 05:47PM EDT by amanda b..

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The Four Humors are four bodily fluids that Humorists[1] believed to be the primary composition of the human body, propagated by ancient Greek physicians. The fluids, black bile (melan chole), yellow bile (chole), phlegm (phlegma) and blood (haima), each correspond to personality traits known as the Four Temperaments.[2]


While the basic idea that the composition of one’s internal fluids reflect the person’s outward demeanor dates back to the ancient Egyptians and Mesopotamians. the internal fluids weren’t systematically categorized until approximately 400 BC when the ancient Greek physician Hippocrates[3] asserted that the amount of each of the four humors inside a person affected their moods and emotions. Hundreds of years later, circa mid-to-late 100s AD, physician Galen of Pergamon[6] directly correlated the humors to Empedocles’[4] theory of the four classical elements[5] earth, wind, fire and water in his dissertation De temperamentis.[9] If someone was in excess of one of the humors, they took on the strongest personality traits affiliated with them: Blood was associated with the “sanguine,” sociable and epicurean, yellow bile was “choleric,” ambitious and enthusiastic, black bile was “melancholic,” introspective and observant, and phlegm was “phlegmatic,” carefree and serene.


The Four Humors were a key section in The Canon of Medicine[7] (القانون في الطب‎ al-Qānūn fī al-Ṭibb)completed in 1025 A.D., which contained all of the known medicine knowledge at the time. The book was originally written in Arabic and later translated into seven other languages and used in medical universities until as late as the 17th century. The four humors gained more associated objects and traits (shown below), which were often exemplified by characters in William Shakespeare’s plays[12] who would criticize each other by referencing their possible humor imbalances.[13]

In the 1600s, Nicholas Culpeper[8] published at least two papers theorizing on the use of the humors in medicine. Many other philosophers and theorists have postulated arguments about the Four Humors over the course of the 18th – 20th centuries, including Immanuel Kant[10], who argued that a person could not freely switch between the temperaments.

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