What is blood pressure?

Blood pressure is a general term used to refer to the level of pressure in your blood vessels. For your blood to reach all of your body's organs, it needs to be pumped out of the heart at a certain level of pressure so that the blood circulation in your body is maintained. Blood pressure is generally measured in mmHg (millimetres of mercury). This value is influenced by your heart's power, the level of resistance in your arterial blood vessels, the blood quantity and other regulatory systems.