Toronto Mayor Rob Ford has been admitted to hospital for what doctors are calling a possible tumour in his abdomen.

"Examination and investigation revealed that he has a tumour," Humber River Hospital President and CEO Dr. Rueben Devlin told reporters Wednesday evening.

"The mayor has been admitted to Humber River Hospital to allow for further investigation to obtain a definitive diagnosis."

Devlin said a CT scan confirmed the tumour.

"A CT scan is very definitive for the tumour. It wasn't a small tumour, but the size is not as relevant as what it is… We really need a biopsy."

Devlin added they also need to make sure there aren't any tumours in other locations. An oncologist will then decide on a course of treatment.

Ford’s brother, Coun. Doug Ford, said the mayor is in "good spirits."

"I just wanted to thank the well-wishers for all of the calls," he said.

Coun. Ford said he had breakfast with his brother Wednesday morning at a Perkins restaurant and he was complaining about stomach pains, so they went to the emergency room.

This is not the first time Ford has been admitted to hospital. In 2009, before he was elected mayor, he reportedly had a tumour removed from his appendix after feeling sharp pains. Ford was treated for kidney stones in 2011. And earlier this year, he went to a rehabilitation facility for drug and alcohol abuse.

Ford's father, a former MPP, was diagnosed with colon cancer in 2006 and died that year.

Ford said they would make an announcement regarding the future of the campaign in the coming days.

My thoughts are with Mayor Ford, Renata, their children and the entire Ford family this evening. Get well soon. — John Tory (@johntoryTO) September 11, 2014