Why Is Hippocrates Called the Father of Medicine? Myths and Facts About the Greek Physician

Hippocrates of Kos (c. 460 – c. 370 BC) is called the "Father of Medicine" because he and the school associated with him are credited with treating illness as the result of natural causes rather than punishment from the gods, and with building medicine on careful observation of patients. That shift, from the temple to the bedside, is the foundation of medicine as a discipline. But there is a twist: we know surprisingly little about Hippocrates himself, many writings carry his name without being his, and his most famous "quote" is not in the oath that bears his name.

A doctor from the island of Kos

Hippocrates was born on Kos, a Greek island in the Aegean Sea, around 460 BC. He probably died in Larissa in Thessaly, although ancient accounts disagree about how old he was. Most of the details of his life come from much later writers and may not be reliable. In other words, Hippocrates is partly a historical person and partly a symbol that later doctors built around a name.

Disease without the gods

In ancient Greece, illness was often explained as the work of gods or spirits, and many sick people went to temples to seek healing. The Hippocratic approach broke with this. Hippocrates is credited with believing that diseases have natural causes, and with separating medicine from religion and philosophy.

A famous Hippocratic text on epilepsy, then called the "sacred disease", argues that it is no more sacred than any other illness; people only call it divine because they do not understand it. That attitude, "if we don't understand it, let's study it", is the core of the scientific spirit.

Watching patients closely

The Hippocratic doctors emphasised clinical observation: watching symptoms over time, recording them, and comparing cases. They placed great importance on prognosis, predicting how an illness was likely to develop, and they categorised diseases systematically. Some physical signs are still named after him, such as "Hippocratic fingers", a term for clubbed fingertips, and the "Hippocratic face", the appearance of a patient close to death.

Their treatments were mostly gentle: rest, diet, cleanliness and supporting the body's own ability to heal. They also used mechanical devices such as the "Hippocratic bench" to set broken bones.

Four humours: the big mistake

Not everything aged well. The Hippocratic tradition is associated with the theory of the four humours, the idea that health depends on a balance of four bodily fluids. That theory rested on flawed ideas about anatomy and physiology and was later discredited. It nonetheless shaped Western medicine for well over a thousand years, which is a reminder that a good method can coexist with a wrong theory.

The Hippocratic Corpus: many authors, one name

About seventy early Greek medical works are known as the Hippocratic Corpus. They were written by many different authors, and it is uncertain which, if any, Hippocrates wrote himself. Some were probably textbooks, some lecture notes and some arguments with other schools.

The Oath, and a phrase that isn't in it

The Hippocratic Oath is an ancient promise in which a new physician swears by the gods of healing to help the sick, keep confidences and avoid certain harmful acts. It is associated with Hippocrates but may have been written after his death. Its ethical principles still influence the oaths that many medical graduates take today.

The phrase most people connect with it, "First, do no harm", does not actually appear in the Hippocratic Oath. A similar idea appears elsewhere in the Hippocratic writings, and the Latin form primum non nocere became popular much later. Another famous line, "Let food be your medicine", is probably a misattribution too.

A legacy that kept travelling

Hippocratic ideas were preserved and developed by the Roman physician Galen, by physicians in the medieval Islamic world, and by doctors after the Renaissance. The specific theories changed completely. The attitude did not: look carefully, write it down, look for natural causes, and put the patient's welfare first.

This article is about the history of medicine and is not medical advice.

Learn with Hippocrates: English phrases

Phrase	Meaning	Example
to take an oath	to make a formal promise	New doctors take an oath.
first, do no harm	avoid making things worse	When editing someone's essay, first, do no harm.
to keep something confidential	not to share private information	Please keep this confidential.
a misquote	words wrongly attributed to someone	That famous line is a misquote.
to get to the root of the problem	to find the real cause	We need to get to the root of the problem.

Try this: Hippocrates looked for natural causes instead of blaming the gods. Write three English sentences about a mistake you keep making in a language and its real cause, using "get to the root of the problem".