Blood pressure is the pressure of blood pushing against the walls of arteries as the heart beats. Blood pressure readings have two numbers, such as 120/80 mm Hg. The first number, called systolic blood pressure, measures the pressure in arteries when the heart beats. The second number, called diastolic blood pressure, measures the pressure in arteries between heartbeats.
According to the American Heart Association, blood pressure numbers of less than 120/80 mm Hg are considered within the normal range. The National Institute on Aging defines normal blood pressure for most adults as a systolic pressure of less than 120 and a diastolic pressure of less than 80. However, blood pressure can vary by age and gender. For example, healthy blood pressure for adults aged 18-39 is 110/68 mm Hg, while for adults aged 60 and over, it is 139/68 mm Hg.
It is important to note that a diagnosis of high blood pressure must be confirmed with a medical professional. A healthcare professional should also evaluate any unusually low blood pressure readings.
