Rudy Giuliani's plane returned to the airport when his condition worsened after takeoff.
(CNN) - Republican presidential candidate Rudy Giuliani will check out of a St. Louis hospital Thursday after he was admitted overnight for flu-like symptoms, his spokeswoman Katie Levinson said.
"After precautionary tests the doctors found nothing of concern at this time, and Rudy will be going back to New York later today," Comella said. "He is in high spirits and is grateful to the doctors and nurses who checked him out."
Giuliani - who had been campaigning in Missouri on Wednesday for the February 5 Republican primary - became ill and then felt worse after his plane took off to return to New York.