Black bile, yellow bile, phlegm and blood.
No, Hippocrates did!
It has no scientific basis.
Hippocrates discovered medicine in 400s BC.
Humors.
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According to Hippocrates the theories of disease causation are the 4 humors, blood, phlegm, yellow and black bile.
In medieval medicine, the colors associated with the four humors were black bile (melancholic) - black, yellow bile (choleric) - yellow, blood (sanguine) - red, and phlegm (phlegmatic) - white. The balance of these humors was believed to affect a person's health and temperament.
The four humors are a historical concept in ancient and medieval medicine, originating from Greek philosophy. They consist of blood, phlegm, yellow bile, and black bile, each associated with specific temperaments and health conditions. The balance of these humors was believed to influence a person's physical and mental health, with an imbalance thought to result in illness. This theory was eventually replaced by modern medical understanding, but it laid the groundwork for later developments in psychology and medicine.
There were supposedly four humors (black bile, yellow bile, blood and phlegm). When someone was sick, the four humors must have been out of balance and to heal, the four humors had to be balanced again.
More like it just faded away (out of silliness), but you still hear references to it in literature ... and some old surgeons.
the aqueous and the vitreous humor