Blood pressure is the pressure exerted by the blood on the fortifications of the blood vessels. Unless indicated or else, blood pressure refers to universal arterial blood pressure, i.e., the pressure in the huge arteries delivering blood to body parts extra than the lungs, such as the brachial artery. The pressure of the blood in additional vessels is lesser than the arterial pressure. Blood pressure values are commonly stated in millimeters of mercury. The systolic pressure is defined as the climax pressure in the arteries during the cardiac cycle; the diastolic pressure is the lowly pressure. The mean arterial pressure and pulse pressure are additional main quantities.

Distinguishing values for a resting, healthy adult human are just about 120 mm Hg systolic and 80 mm Hg diastolic, with huge individual variations. These actions of blood pressure are not fixed, but undergo normal variations from one heartbeat to another or during the day; they also alter in response to stress, food factors, drugs, or disease.

Blood pressure that is too low is identified as hypotension. The resemblance in pronunciation with hypertension can cause puzzlement.

Low blood pressure may be an indication of severe disease and requires critical medical attention.

When blood pressure and blood run decrease beyond a sure point, the perfusion of the brain becomes seriously decreased, causing dizziness, weakness and fainting.

However, people who meaning well while maintaining low blood pressures have lesser rates of cardiovascular disease actions than people with normal blood pressures.