Most doctors in the United States recite a professional oath at their medical school graduation, but it’s rarely the original Hippocratic Oath. A 2009 survey of 135 US and Canadian medical schools found that only 11 percent use the classical version written in ancient Greece. The most common choice, used by about 33 percent of schools, is a modernized version written in 1964 by Louis Lasagna, a dean at Tufts University. Many schools now write their own oaths or let students help craft them.
What the Original Hippocratic Oath Says
The Hippocratic Oath dates back roughly 2,500 years to ancient Greece. It’s named after Hippocrates, widely considered the father of Western medicine, though scholars debate whether he personally wrote it. The original text includes several commitments that feel familiar today: treating the sick to the best of one’s ability, avoiding harm, and keeping patient information private. The confidentiality language is striking in how modern it sounds: “Whatsoever in the course of practice I see or hear that ought never to be published abroad, I will not divulge, but consider such things to be holy secrets.”
Other parts of the original oath are clearly products of their time. It includes a pledge to the Greek gods Apollo and Asclepius. It forbids surgery entirely, with the specific instruction “I will not use the knife even on sufferers from stone,” referring to bladder stones, a common and agonizing condition in the ancient world. Surgeons were considered a separate class of practitioners. The oath also prohibits giving deadly drugs to anyone, even if asked, and bars physicians from helping cause an abortion. These provisions are why most schools have moved away from the original text.
The Modern Versions
The Declaration of Geneva, adopted by the World Medical Association in 1948, is the closest thing to a global standard. It was created in the aftermath of World War II, partly in response to horrific medical experiments carried out by Nazi physicians. The declaration has been revised multiple times since then. A 2017 update added a notable new line: “I will attend to my own health, well-being, and abilities in order to provide care of the highest standard.” That addition reflected growing awareness of physician burnout and the recognition that a doctor’s own health directly affects patient care.
The Declaration of Geneva also strengthened the oath’s confidentiality language, requiring physicians to “respect the secrets which are confided in me, even after the patient has died.” That principle now has legal force through laws like HIPAA, the 1996 federal law that requires doctors and health care institutions to protect individually identifiable health information in any form, whether electronic, written, or spoken. The ethical commitment came first; the legal framework followed.
Louis Lasagna’s 1964 version, the single most popular oath in North American medical schools, takes a warmer, less formal tone than either the ancient oath or the Declaration of Geneva. It drops the religious invocations and the prohibition on surgery, and it acknowledges that medicine involves more than treating disease. It includes the idea that “warmth, sympathy, and understanding may outweigh the surgeon’s knife or the chemist’s drug.” It also contains a humility clause, reminding physicians that they do not treat diseases on a chart but sick human beings.
Osteopathic Doctors Take a Different Oath
Doctors of Osteopathic Medicine (DOs), who make up a growing share of US physicians, recite the Osteopathic Oath instead. It shares core themes with other medical oaths, including a commitment to preserve life, guard patient secrets “with scrupulous honor and fidelity,” and use only recognized treatment methods consistent with good judgment. What sets it apart is an explicit focus on the body’s natural healing capacity. The oath pledges the physician to “be ever alert to further the application of basic biologic truths to the healing arts” and to develop the principles first outlined by Andrew Taylor Still, the founder of osteopathic medicine, in the 19th century.
When the Oath Happens
The oath is typically recited twice during a doctor’s training. The first occasion is the White Coat Ceremony, which takes place at the start of medical school. About 97 percent of accredited allopathic (MD) medical schools in the United States hold a White Coat Ceremony or similar event, and osteopathic schools increasingly do the same. Students receive their first white coat and recite an oath or pledge as a symbolic entry into the profession. The second recitation happens at graduation, before students begin residency training.
The Oath Is Symbolic, Not Legal
The medical oath carries no legal weight. It is not a contract, and violating its principles does not automatically constitute malpractice or result in losing a medical license. As one analysis in the Indian Journal of Psychiatry put it, “The oath is not legally binding. It is more of an ethical signpost.” Licensing, discipline, and malpractice are governed by state medical boards, federal regulations, and the courts, not by the words recited at graduation.
That said, the oath isn’t entirely without legal significance. Courts have occasionally referenced Hippocratic principles when ruling on physician conduct, particularly in cases involving neglect of duty. And the ethical pillars embedded in the oath, doing good for the patient and avoiding harm, remain the foundation of medical ethics codes enforced by licensing bodies. The oath itself may be ceremonial, but the principles it expresses are woven into the regulatory systems that govern medical practice.
The Core Principles Across All Versions
Despite variations in language and emphasis, every major version of the medical oath circles the same core commitments. The first is beneficence: acting in the patient’s best interest. The second is non-maleficence, the famous “do no harm” principle that traces directly to Hippocratic teaching. The third is confidentiality, protecting what patients share. And the fourth, more prominent in modern versions, is respect for patient autonomy, the idea that patients have the right to make informed decisions about their own care.
These four principles aren’t just historical artifacts. They shape how medical ethics committees evaluate difficult cases, how hospitals write their policies, and how physicians are trained to think through the conflicts that arise daily in clinical practice. The words of the oath may change from school to school and decade to decade, but the underlying commitments have remained remarkably stable for over two millennia.