Dr Hilary spoke to ITV Daybreak about broadcaster Andrew Marr, who is recovering in hospital after suffering a stroke.
He said that ruptured arteries, which can often cause a stroke can happen at any time, to anyone from any age.
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The England cricketer will miss Wednesday's One-Day International against the West Indies after he was arrested in Bristol on Monday.
The TV star, known for his role in the 1960s sitcom, was also the father of Cherie Blair.
Former Labour Deputy PM who oversaw an explosion in the contracts now says they are "crucifying" the health system.