You don’t have to know a lot about history to know that people used to think illness could be caused by too much blood, and so the way to cure illness was to bleed the patient. I heard that George Washington died as a result of being bled to treat pneumonia (turns out it was actually “acute epiglottitis“). We just shake our heads and sigh at the ignorance.
You may not realize that the idea of “having too much blood” made perfect sense, supported by evidence and observation. Continue reading