
Medieval doctors retained some medical knowledge from the Greek and Roman eras, despite the fact that much was lost during the Dark Ages. Unfortunately these doctors accepted the ideas of the ancients without question, and held many superstitious beliefs. This meant that patients often got worse, rather than better, under their care.
Medieval doctors flattered to deceive, although there were developments that gave the appearance of progress:

A French manuscript illumination from Guy de Chauliac's 'Chirurgia Magna' of 1363, showing a dissection at the Faculty of Montpellier
These signs, however, were deceiving . For example:
"...doctors were useless and indeed shameful as they dared not visit the sick for fear of becoming infected"wrote Guy de Chauliac.