from Section I - Developmental Hematology
Published online by Cambridge University Press: 30 January 2021
Ancient concepts of the blood were described by Hippocrates and Galen 2000 years ago in their doctrine of “humors.” It was believed that the body was made up of four humors – blood, phlegm, black bile, and yellow bile – and that these four components had the qualities of heat (hot-blooded!), cold, moist, and dry. The Galenic concept of the blood prevailed through the Middle Ages. Health or disease were a result of an imbalance, between these humors. This was the basis of the practice of therapeutic bloodletting (which, fortunately, was performed infrequently on children) through the mid nineteenth century as a way to rid the body of the imbalance of humors believed to cause a wide variety of diseases.
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