The Greeks are known to have dissected corpses and examined the internal workings of human bodies. However, historians question whether they performed internal surgical operations.
The Greek city-states were frequently at war, and Greek doctors became experts at practical first aid.
They also learned about setting broken and dislocated bones (they could cure a slipped disc by standing on the patient's back).
We have no evidence, however, that Greek surgeons successfully operated inside the body. Greek doctors did not have anaesthetics, and only had herbal antiseptics - so successful surgical operations would have been extremely difficult for them to perform.