Explain in details how Galen , a physician during the Middle Ages, expanded on Hippocrates' theory of the four humors and explain what he believed each other humor represented ?

Galen expanded on the Hippocrates' theory of humor by assigning personalities, moods, behaviors, and emotions to the four humors. He believed blood stood for sanguine personality, black bile for a melancholic personality, yellow bile for a choleric personality and phlegm for a phlegmatic personality.

Explanation:

Hippocrates put forward the theory of the four humors. According to the theory, the human body is made up of four substances: black bile, yellow bile, blood, and phlegm. A healthy human body is the product of a balance of among the four humors, while diseases results if there is an imbalance among the four humors.

Galen, a keen admirer of Hippocrates' ideas, further elaborated on this theory and believed that they affected personalities, moods, behaviors, and emotions.

The personalities assigned the four humors are as follows:

People with predominantly black bile are Melancholic (corresponding to the season of autumn dry and cold): They are very sensitive, and enjoy artistic pursuits.

People with predominantly yellow bile are Choleric (corresponding to the season of summer, dry and hot): They possess a passionate temperament, They have a lot of ambition, energy, drive, enormous vitality but are domineering and get angry quickly.

People with predominantly blood are Sanguine (corresponding to the season of spring, wet and hot): These people are confident, joyful, optimistic, expressive, confident, rational and sociable.

People with predominantly phlegm are Phlegmatic (corresponding to the season of winter, wet and cold): They are deep thinkers, fair, calm, very consistent, relaxed, and observant, willing to compromise, and hard workers.