What is this stuff about the humor of hot or cold of moist or dry in Canterbury Tales by the doctor?

Answer 1

It means that the doctor treats his patients using medieval ideas about a balance of the four humors (or fluids) in the body. It used to be believed that illnesses were caused by an improper balance of the four fluids.

Answer 2

In the "Canterbury Tales," the Doctor's humor of "hot or cold, of moist or dry" refers to the belief in medieval medicine that an individual's health and temperament were determined by the balance of these four humors in the body. The Doctor's mention of this theory showcases his knowledge of medical practices of the time, adding a humorous element as it highlights the outdated nature of such beliefs. This portrayal of the Doctor's knowledge reflects the satirical tone Chaucer employs towards various characters in the collection.