Zebra (medicine) – Wikipedia, the free encyclopedia
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Zebra is the American medical slang for arriving at an exotic medical diagnosis when a more commonplace explanation is more likely.[1] It is shorthand for the aphorism coined in the late 1940s by Dr. Theodore Woodward, professor at the University of Maryland School of Medicine, who instructed his medical interns: “When you hear hoofbeats, think of horses not zebras”.[2] Since horses are common in Maryland while zebras are relatively rare, logically one could confidently guess that an animal making hoofbeats is probably a horse. By 1960, the aphorism was widely known in medical circles.[3]
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https://en.m.wikipedia.org/wiki/Zebra_(medicine)