Know your Blood Pressure High blood pressure is the highest risk factor for strokes - with 40% of recorded strokes being caused by high blood pressure. Therefore knowing your blood pressure, and taking measures to control it, could prevent you from becoming the patient. Know Your Blood Pressure is a campaign led by The Stroke Foundation. Project events across the region test your blood pressure for free - it's quick and painless, and could save your life. To find out when and where the next Know Your Blood Pressure event is happening near you, Click Here.