Many of Andrew Marr's colleagues in the media took to Twitter to express their sympathy.
Fellow BBC politics presenter Andrew Neil wrote:
Very distressed to hear news about Andrew Marr. Best wishes for full and speedy recovery.
Guardian columnist Polly Toynbee tweeted:
Andrew Marr, renaissance man, polymath,wise commentator,painter,runner,brilliant cook - and ace editor.Get well soon.Needed in public life.
Former Tory MP Louise Mensch said:
More top news
After being sentenced for the manslaughter of his girlfriend Reeva Steenkamp Oscar Pistorius is spending his first night in prison.
ITV News sees first hand the terrible cost of the Ebola virus - not just to those killed, but to those who are left behind.
After winning the Italian version of The Voice Sister Cristina has released her first single, a cover of one of Madonna's best known hits.