Simple lifestyle changes could prevent more than 20,000 people a year dying from a stroke, say experts.
The researchers looked at stroke incidence across the UK
The Stroke Association said 50,000 strokes a year - 40% of the total - could be prevented if people took steps to keep their blood pressure under control.
This can be done by regular monitoring coupled with taking exercise, switching to a healthy diet, and, if still necessary, medication.
Around ten million people in the UK have high blood pressure, and many of these are among the 130,000 who have a stroke for the first time each year.
Main symptoms of a stroke
sudden numbness or paralysis
sudden slurred speech
difficulty finding words
However, a survey carried out by the charity has found that 84% of people are unaware of the risks.
Six out ten of the 999 people questioned did not know, even roughly, what their blood pressure was.
The survey also found:
Margaret Goose, chief executive of the Stroke Association, said: "Despite the great amount of educational information available to people, it is disappointing so few of those surveyed were aware that by simply reducing blood pressure they can reduce the risk of stroke."
- 62% of people knew someone close to them who had had a stroke
- Of those 40% had died because of the stroke
- Over a quarter - 28% - were unable to list any of the main symptoms of a stroke
Dr John Pittard, a GP from Middlesex, said: "Patients should ask their GP or practice nurse for more information on reducing their risk of stroke and ensure they have their blood pressure checked regularly so that it can be adequately controlled if necessary."
A stroke is the term used to describe the effects of an interruption of the blood supply to an area of the brain causing brain cells to be damaged or to die.
It is the biggest cause of disability in the UK. Of those who suffer from a stroke, only one in three go on to make a full recovery.
It is estimated that the annual cost of stroke to the NHS is over £2.3 billion.
The Stroke Association is launching a campaign to raise public awareness of stroke.