High blood pressure, also known as hypertension, affects over 65
million people in this country. It is sometimes referred to as the
"silent killer" because a lot of people that have it are unaware of
their condition. According to the American Heart Association (AHA),
blood pressure is the pressure of the blood against the walls of the
arteries. When you have your blood pressure tested it is reported as
two numbers, systolic and diastolic. One is created when the heart
pumps blood into the circulatory system and the other is the force of
the arteries as they resist blood flow.

http://www.allvoices.com/contributed-news/6054333-how-much-do-you-know-about-high-blood-pressure

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