Ford, 43, admitted himself to the hospital Tuesday, press secretary George Christopoulos said.

"He's undergone a number of tests, he's being treated and he's feeling much better today," he said.

"Doctors have identified an irritation in the mayor's throat and stomach which have aggravated his asthma and he is being treated for those conditions."

There is no word on when Ford will be released from hospital.

"The mayor is in good spirits and is resting comfortably," Chrisopoulos said. "He is looking forward to going home as soon as doctors allow."

In February 2011, the mayor had to undergo a procedure to break up a kidney stone.

"It was very painful and I'm glad it's out," Ford said at the time. He also had surgery 10 years earlier for a kidney stone.

In July 2009, when he was a city councillor, Ford went to the hospital with "excruciating pain" and ended up having emergency surgery to remove a tumour from his appendix.