Trebek, 71, who was admitted on Saturday, was said to be in good spirits. He is under observation and undergoing further testing.
He is expected to fully recover and be back at "Jeopardy!" when production begins taping in July for the new season, the show's 29th.
Trebek was hospitalized for another minor heart attack in December 2007, and emerged from a car crash without any injuries in 2004 when he fell asleep at the wheel.