The journalist, 53, fell ill on Tuesday (08Jan13) and is now receiving attention at a local medical centre in London.
A statement from BBC News reads, ""The hospital confirmed he has had a stroke. His doctors say he is responding to treatment. His family have asked for their privacy to be respected as he recovers. His colleagues and the whole BBC wish him a speedy recovery.""
Both the presenter's programmes, The Andrew Marr Show and Radio 4's Start The Week, will continue to air without interruption, and guest hosts will fill in for the father-of-three while he recovers.