The man and the collection
Hippocrates of Kos is the most famous name in ancient medicine, yet remarkably little is certain about him. He was born on the Greek island of Kos, probably around 460 BCE, and was a practising physician and teacher. Both Plato and Aristotle mention him as a famous doctor. Beyond that, later biographies add detail that cannot be checked.
The writings known as the Hippocratic Corpus are a different matter. This is a collection of around sixty works in Greek, assembled in antiquity, produced by many authors across perhaps a century or more. They cover a wide range of subjects, and they do not agree with each other. Scholars have long debated which, if any, were written by Hippocrates himself, and there is no agreed answer. It is safest to say that the Corpus reflects a medical tradition associated with his name.
Observation and the case history
One of the strongest features of the Corpus is its attention to careful observation. The Epidemics books record case histories: a patient’s name or place, the day-by-day course of the illness, symptoms such as fever, pain, colour and breathing, and often the outcome. A notable number of the cases end in death, which suggests that the authors were not simply recording successes.
This record-keeping gave physicians material for recognising patterns. It also fits the Corpus’s interest in prognosis, meaning the prediction of how an illness will go. A physician who could correctly foretell a course of disease gained credibility with patients and their families, which mattered when physicians had no licence to guarantee trust.
Natural causes
A well-known text, usually called On the Sacred Disease, discusses epilepsy, which many people believed to be a divine affliction. The author argues that it has a natural cause and is no more sacred than other diseases. He is critical of healers who claim to cure it by purifications and incantations. This passage is often quoted as an early statement of a naturalistic view of illness. The outlook has parallels in the speculations of the Presocratic thinkers about nature. It should be remembered, though, that the same author still reasons within the ideas of his time, such as the role of phlegm.
The text Airs, Waters, Places links health to climate, seasons, winds, water supply and the location of cities. It also includes generalisations about different peoples that reflect the writer’s assumptions and are not reliable ethnography. It is nevertheless valuable evidence that physicians considered the environment as a cause of illness. The link between health and the cycle of the year also relates to the Greek seasonal calendar.
Humours, regimen and treatment
The Corpus does not present one fixed theory. Some treatises explain health through a balance of bodily fluids, such as blood, phlegm and bile; the best-known formulation of what later became humoral theory appears in On the Nature of Man, usually thought to be associated with Polybus, Hippocrates’ son-in-law according to later tradition. Other texts use different explanations, such as the role of air or heat.
Treatment tended to be conservative. Physicians stressed regimen, meaning diet, exercise, rest, bathing and sleep, and they used drugs, bleeding, purging and simple surgery where they thought it necessary. Specialised texts deal with fractures and dislocations, and these show considerable practical skill, including methods of setting bones and using traction. Other texts, however, rest on theories that modern medicine does not accept.
Diagnosis in practice
Diagnosis consisted of examining the patient closely, asking about history, and noting signs such as the pulse, colour, urine, sweat and the position the patient lay in. The physician made decisions at the bedside and might return daily as the disease progressed. There were no instruments for internal measurement, no laboratory tests, and an incomplete understanding of anatomy, so interpretation depended on the physician’s judgement.
Ethics and the Oath
The best-known text is the Hippocratic Oath, a short statement in which the physician swears by the healing gods to follow a code of conduct. It includes a promise to help the sick according to the physician’s ability and judgement, to keep from doing harm, to maintain confidentiality, and to refrain from sexual relations with patients. It also includes commitments to the physician’s teacher and his family, and it contains clauses on abortion and on surgery that were not universally accepted in the ancient world.
The Oath was not a universal licensing requirement, and we do not know how widely it was sworn. It gained a much larger reputation in later centuries. Modern medical oaths and declarations draw inspiration from it but differ in content. Other ethical writings in the Corpus, such as Decorum and Precepts, discuss how a physician should behave, including appearance, manner and fees.
Why the tradition mattered
The Corpus was studied and commented on in Ptolemaic Alexandria, then by Galen, who treated Hippocrates as the ideal physician and shaped his image for later readers. From there it passed into Arabic and Latin medicine. The cultural weight of “Hippocrates” thus grew enormously, even as the actual authors faded from view.
This does not mean ancient doctors were Hippocratic in a simple sense. Greek and Roman medicine was varied, and many practitioners followed other schools or no school. The Corpus is best treated as one important set of voices within a much larger and more varied practice, one that valued observation and recorded uncertainty more often than later reputations suggest.