Article: Dr Miriam Stoppard's Health Focus: UNDERSTANDING HIGH BLOOD PRESSURE, Part 1; Dr Miriam Stoppard's Health Focus.(Features)

YOUR blood pressure is the pressure of blood surging through the main arteries each time the heart beats and empties. It's measured as the height of the column of mercury it can hold up - mmHg.BLOOD pressure varies during the day and goes up as a response to stress and physical activity, and down when you rest and sleep.

But a person with high blood pressure, or hypertension, has a high blood pressure even at rest.

People can have hypertension without realising it because you don't get symptoms unless your blood pressure's very high.

But ...

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