A crowded marketplace of healers
There was no single “ancient medicine” in the Greek and Roman worlds. A sick person might consult a family member, buy a remedy from a root-cutter or drug seller, pray at a shrine, visit a travelling physician, or try several of these in turn. Many healers had no formal training, and there was no state licence that separated “real” doctors from others. What we usually call Greco-Roman medicine is the part of this activity that left written records, which mainly means educated physicians and the authors who wrote about them. It tells us less about the many ordinary people who treated illness at home.
This article gives the overall picture from roughly the fifth century BCE to the second century CE. Separate articles cover the individual strands in more depth.
Older roots
Greek medicine did not appear from nothing. Egypt and Mesopotamia had long traditions of written treatments, and Greek writers themselves sometimes admired Egyptian physicians. Egyptian medical knowledge survives in papyri that combine practical remedies with spells, and Mesopotamian healers worked with a mixture of ritual and treatment. How much the Greeks borrowed, and how much they developed independently, is difficult to measure, because the surviving evidence is uneven.
Temples and the god of healing
For many Greeks, healing was first of all a religious matter. The cult of Asclepius spread through the Greek world, with sanctuaries where visitors made offerings, slept in a sacred space and hoped for a cure through a dream. The cult was introduced to Rome, according to tradition, in the early third century BCE during a time of epidemic. These sanctuaries did not compete with physicians so much as sit alongside them, and some people clearly used both.
Observation and the Hippocratic tradition
From about the fifth century BCE, a body of writings associated with the island of Kos and the name of Hippocrates presents a more naturalistic approach. These texts emphasise careful observation of the patient, the course of a disease, diet, climate and daily habits. Some argue directly that diseases have natural causes rather than divine ones. The collection is not the work of a single author, and it contains views that disagree with one another.
Alongside these writings, Greek thinkers tried to explain the body in terms of general principles. The best-known is the idea that health depends on a balance of bodily fluids, usually presented as blood, phlegm, yellow bile and black bile. This framework was flexible and lasted for many centuries. It also fitted comfortably with the four elements theory found in natural philosophy and with the speculation of the Presocratic thinkers about what the world was made of.
Anatomy in Alexandria
Dissection of human bodies appears to have been practised briefly in Alexandria in the third century BCE, associated with Herophilos and Erasistratus. Their work is known mainly through later authors, and details are uncertain. Human dissection later faded from practice. By the Roman period, anatomical knowledge depended heavily on observation of wounds and on animal dissection.
Rome: Greek ideas in a Roman setting
The Romans had their own household remedies and a strong tradition of domestic medicine, and some Romans, such as the elder Cato, were openly suspicious of Greek doctors. Over time, however, Greek physicians became common in Roman cities, many of them freedpeople or enslaved people, and some became wealthy and well known. Roman writers also collected medical knowledge. Celsus wrote a Latin medical survey in the first century CE, and Pliny the Elder compiled a large natural history that includes many remedies. Dioscorides, a Greek author working in the Roman Empire, compiled a widely used catalogue of drugs.
Public health in the Roman sense was mostly an engineering and civic matter rather than a medical one. Roman aqueducts and drains improved water supply in cities, and the Roman public baths were part of daily hygiene and also a social habit. Whether these did much to reduce disease is debated, since crowded cities still suffered from many infections.
Galen and the system that lasted
Galen, born at Pergamon in the second century CE and later active in Rome, wrote an enormous amount on anatomy, physiology, drugs and the training of physicians. He combined Hippocratic ideas, humoral theory and his own experiments, mainly on animals, into a system that was influential for well over a thousand years in the Mediterranean world and beyond. His confidence also helped to preserve some of his mistakes.
The army and the surgeon
Rome’s military created a distinct medical setting. Roman legions had medical personnel, and permanent forts could include a hospital building. Evidence for what these men could do is partial, but surgical instruments have been found at military sites. The topic deserves its own treatment, but it shows that medicine in Rome was not only a matter of private physicians.
What worked and what did not
Ancient healers could set fractures, treat wounds, perform some operations such as removing stones or draining abscesses, and use plant-based drugs, some of which have real pharmacological effects. They had no understanding of germs, no reliable anaesthesia and no effective treatment for most infections. Diet and regimen, meaning advice about food, exercise, sleep and routine, were central to many physicians’ practice. Surgery was risky, and outcomes depended heavily on luck and the strength of the patient.
It is also easy to overstate how scientific or how primitive this medicine was. Healers made careful observations, but they also relied on theories that were not tested in the modern sense. The fair summary is a mixture: some practical skill, some reasoned theory, a great deal of ritual and tradition, and widely varying quality.
Reading the evidence with care
Most of our evidence comes from texts by a small educated minority, with additional information from inscriptions, tools and votive offerings left in sanctuaries. Women healers and midwives are mentioned in inscriptions and by authors such as Soranus, who wrote on gynaecology, but they are less visible than male physicians. Anyone using these sources should remember that they show what authors thought and claimed, not necessarily what happened at the bedside. This matters even more when the topic touches on health today: ancient treatments are a subject of historical interest, not advice.