Blood pressure refers to the force against your blood vessels when your body circulates blood. A blood pressure reading contains two numbers. The top number measures the pressure when your heart pumps blood (systolic). The bottom number measures the pressure when your heart is at rest (diastolic).
High blood pressure – or hypertension – usually has no symptoms. But it can cause serious problems, such as stroke, heart disease, heart attacks and kidney failure. That’s why having your blood pressure checked regularly is important – even when you’re feeling fine.