High Blood Pressure - Numbers

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What is high blood pressure?

High blood pressure (HBP) or hypertension means high pressure (tension) in the arteries. Arteries are vessels that carry blood from the pumping heart to all the tissues and organs of the body. High blood pressure does not mean excessive emotional tension, although emotional tension and stress can temporarily increase blood pressure. Normal blood pressure is below 120/80; blood pressure between 120/80 and 139/89 is called "pre-hypertension", and a blood pressure of 140/90 or above is considered high.

The top number, the systolic blood pressure, corresponds to the pressure in the arteries as the heart contracts and pumps blood forward into the arteries. The bottom number, the diastolic pressure, represents the pressure in the arteries as the heart relaxes after the contraction. The diastolic pressure reflects the lowest pressure to which the arteries are exposed.

An elevation of the systolic and/or diastolic blood pressure increases the risk of developing heart (cardiac) disease, kidney (renal) disease, hardening of the arteries (atherosclerosis or arteriosclerosis), eye damage, and stroke (brain damage). These complications of hypertension are often referred to as end-organ damage because damage to these organs is the end result of chronic (long duration) high blood pressure. For that reason, the diagnosis of high blood pressure is important so efforts can be made to normalize blood pressure and prevent complications.

It was previously thought that rises in diastolic blood pressure were a more important risk factor than systolic elevations, but it is now known that in people 50 years or older systolic hypertension represents a greater risk.

The American Heart Association estimates high blood pressure affects approximately one in three adults in the United States -- 73 million people. High blood pressure is also estimated to affect about two million American teens and children, and the Journal of the American Medical Association reports that many are underdiagnosed. Hypertension is clearly a major public health problem.

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See what others are saying

Comment from: janb, 75 or over Female Published: July 18

I have recently had brain scan...told I had chronic condition--not enough blood to brain and had suffered irreparable damage to brain as result. This was supposedly caused by high blood pressure..tho I was taking 3 blood pressure meds, it was still running high. After having meds doubled I have blood pressure much more under control; however, I am somewhat concerned because when the systolic number is acceptable, the diastolic number is running extremely low, sometimes as low as 39.

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Comment from: cathrine, 35-44 Female (Patient) Published: March 14

My bottom number was higher than my top number.

Was this comment helpful?Yes

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