John Bishop has cancelled six October performances in the US and Canada after doctors advised him not to take long-haul flights
The comedian was due to appear in New York, Boston, Vancouver, Ottawa, Montreal and Toronto, with ticket providers set to contact customers
Bishop said he hopes the dates can be rearranged, although no new schedule has been confirmed
He has also withdrawn from a Prostate Cancer UK fundraising cycling event involving Chris Hoy
Bishop had been due to ride alongside astronaut Tim Peake.