Trebek, 71, was admitted into Cedars-Sinai Medical Center in Los Angeles on Saturday, Sony Television said in a statement.
"Trebek is in good spirits and is currently under observation and undergoing further testing," the statement said.
"Jeopardy!," a general knowledge quiz, is one of the longest-running game shows on U.S. television, entering its 29th season in July. Trebek was hospitalized for an earlier heart attack in 2007.
(Reporting by Mary Slosson; Editing by Cynthia Johnston and David Brunnstrom)
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