ABC News' Jan Simmonds Reports: Rudy Giuliani checked himself into and stayed overnight at Barnes Jewish Hospital in St. Louis Wednesday evening with flu-like symptoms.
"After precautionary tests the doctors found nothing of concern at this time and Rudy will be going back to New York later today. He is in high spirits and is grateful to the doctors and nurses who checked him out," Giuliani Campaign communications director Katie Levinson told ABC News.
The former New York City mayor appeared a little worn out at his final event of the day on Wednesday in Chesterfield, Missouri, but he made no mention about feeling under the weather at the time.
The Associated Press reports that Giuliani had felt the symptoms while campaigning throughout the day in Missouri but only decided to go to a hospital when they worsened during the evening.
"The symptoms worsened as the day wore on and shortly after taking off from Chesterfield, Missouri, for New York the mayor became uncomfortable enough that our plane returned to the airport in Chesterfield," Levinson told the AP. "To be on the safe side, the mayor consulted with his personal physician in New York and made the decision to go to the Barnes Jewish Hospital in St. Louis for routine tests."
The Republican presidential candidate had a long day of campaigning on Wednesday, made only longer when his charter plane was grounded by mechanical problems after his first events of the day in Kansas City. As a result, Giuliani along with Senator Kitt Bond, R-Mo., traveled across the state via car for a Town Hall meeting in Columbia and then to a fundraiser in Chesterfield.
Giuliani has no scheduled public appearances on Thursday and is next expected to be on the campaign trail on Friday in New Hampshire for a three day swing before the Christmas holiday.