They ruled out several potential causes before stumbling on a reason for the 56-year-old man's kidney problems. He said he drank about 16 8-ounce cups of iced tea every day. Black tea has a chemical known to cause kidney stones or even kidney failure in excessive amounts.
"It was the only reasonable explanation," said Dr. Umbar Ghaffar of the University of Arkansas for Medical Sciences in Little Rock. She and two other doctors describe the case in Thursday's New England Journal of Medicine.
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