The Short Answer: 76% of medical organisations use the caduceus (two snakes, wings) as their symbol. The correct medical symbol is the Rod of Asclepius (one snake, no wings). The mix-up originated from a US Army clerical error in 1902.

The medical symbol most people recognise, two snakes winding around a winged staff, is almost certainly the wrong one. The deity it actually represents is the Greek god of thieves, merchants, and liars.

Two Symbols, One Enormous Mix-Up

The correct symbol of medicine is the Rod of Asclepius: one snake, no wings, coiled around a rough wooden staff. Asclepius was the Greek god of healing. The single serpent represents renewal (snakes shed their skin), and the staff represents the physician's authority. Simple, ancient, and specifically medical in origin.

The Caduceus, the one with two snakes and wings, belongs to Hermes, the Greek god of commerce, trickery, and safe passage to the underworld. It has absolutely nothing to do with medicine. It never did.

How It Happened

The mix-up traces back to a single decision. In 1902, a captain in the US Army Medical Corps proposed the caduceus as the corps' official insignia. The suggestion was accepted, and the winged symbol became embedded in American military medicine.

By 1917, the Surgeon General's librarian had discovered the mistake. His response, according to historical accounts, was to lament the error and do precisely nothing to correct it.

From there, the caduceus spread across American healthcare. Hospitals adopted it. Medical schools printed it on their crests. Pharmaceutical companies put it on their packaging. Each new adoption made the symbol appear more legitimate.

The Numbers

An entire industry built around healing has accidentally adopted the symbol of a god associated with deception and commerce. Medical historians have not missed the irony. Interestingly, most countries outside the United States use the correct Rod of Asclepius. The World Health Organisation, the Royal Army Medical Corps, and the majority of European medical associations all display the single-serpent staff. The error is overwhelmingly an American export, carried abroad by the sheer cultural weight of US healthcare branding.

Getting the Details Right

This century-old mistake persists because nobody checked the original source, and once the error became tradition, it proved remarkably resistant to correction. Getting the details right matters in medicine. The same attention to accuracy that should have caught this blunder is the same attention that should inform every decision in the operating theatre, from protocols to what the team wears.

Sources

• Friedlander WJ, "The Caduceus as a Medical Emblem," PMC. PMC6913859