In pictures: Guinness medical record breakers
Most kidney stones produced

As of April 16, 2003, Don Winfield of Caledonia, Ontario, Canada, has produced and passed an excruciating 4,504 kidney stones, ranging in size from a grain of sand to a dried pea.

Eventually, the kidney had to be removed.

"At its worst," says Don, "I produced 22 stones in 24 hours... and 35 over a period of five days."

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