Hippocrates (c. 460 – c. 370 BC) was a Greek doctor who is called the "father of medicine". He was the first person to write that people got sick for scientific reasons. People used to believe disease was caused by angry (mad) gods.
Hippocrates wrote about treating sick people. His writings are still important to doctors today. He said many ideas that doctors still study. An idea he wrote about is "patient confidentiality". This means that doctors cannot tell anyone else what their patients tell them. Another idea is that the doctor cannot do anything to kill a patient. These kinds of ideas are part of medical ethics.
The Hippocratic Oath is named after him. This is a promise or oath doctors say. This means they say they will do what is said in the Hippocratic Oath. (People now think that Hippocrates did not write it.)
Most medical schools today use a new version. This means that some things are changed. But the important ideas are the same.

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