Around 150,000 people have a stroke each year in the UK with about a quarter of these in people of working age, according to the Stroke Association.
Its director of communications, Joe Korner, said:
We are deeply saddened to hear about Andrew Marr's stroke and our thoughts are with him and his family at this hard time.
A stroke happens in an instant but the effects can often last a lifetime.
However with the right care and support it is possible to make a recovery and return to a life after stroke.
More top news
Comedian Peter Kay has said he is "thrilled" to star in a adaptation of broadcaster Danny Baker's autobiography.
MPs have warned of legal loopholes are allowing police to store photographs of innocent people to use with facial recognition systems.
One of the great tragedies of the First World War is the number of youths who lied about their age to enlist particularly in the Royal Navy.