Rob Ford has been diagnosed with two tumours that are attached to his bladder, according to his brother Doug Ford.

Rob Ford began chemotherapy on Thursday at Mount Sinai Hospital to treat a recently discovered tumour on his bladder.

Ford originally said he was told by doctors that he had one tumour but Doug Ford told reporters that it’s actually two tumours on top of each other. 

One of the tumours is 5 cm and the other is 7 cm, according to Doug Ford. 

“Rob's in a massive battle right now. So we're just going to keep fighting and do whatever we can, leave no stone unturned,” Doug Ford said outside the hospital.

The diagnosis comes after Ford says he started to feel a “shooting pain” after he urinated about a month ago. Doctors discovered the tumour last week, when he was hospitalized for several days with abdominal pain.

The 45-year-old former Toronto mayor was diagnosed with a rare and aggressive form of soft-tissue cancer in Sept., 2014, forcing him to quit his re-election campaign. He underwent surgery in May, to have a cancerous tumour removed from his abdomen.