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Originally published March 21, 2017
Last updated April 26, 2024
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Normal blood pressure is a vital body function. Without blood pressure — the force that moves blood through our circulatory system — oxygen or nutrients would not reach our tissues and organs through our arteries nor would white blood cells be distributed through our bodies. Blood pressure also helps carry the toxic waste in our bodies through our liver and kidney.
The heart creates blood pressure by pushing out blood when it contracts with each heartbeat. Blood pressure is also caused by the difference in pressure between the heart and the smaller branches of the arteries. The condition of the arteries also affects the blood pressure and flow.
Blood pressure is expressed with two equally important numbers, for example, 120/80. The top number represents systolic pressure, the amount of pressure in arteries during the contraction of the heart muscle. The bottom number is the diastolic pressure, which refers to the blood pressure when the heart muscle is between beats.
When the blood pressure is normal, the top number is less than 120, and the bottom number is less than 80, according to the American Heart Association (AHA).
“In order to get an accurate reading, patients should use an automated oscillometric device that measures blood pressure in the brachial artery (upper arm) and perform measurements in a quiet room after five minutes of rest in the seated position with the back and arm supported,” says Rose Taroyan, MD, a family medicine physician at Keck Medicine of USC and clinical associate professor of family medicine at the Keck School of Medicine of USC. “At least 12 or 14 measurements should be obtained, with both morning and evening measurements taken, over a period of one week.”
If the numbers are higher than the ideal range, the heart is working too hard to pump blood to the body. When the numbers are lower than ideal it means that your blood pressure is too low and doesn’t supply your body and heart with enough oxygenated blood. Low blood pressure is known as hypotension. It’s not normally a cause for concern unless you start to experience symptoms.
If your blood pressure is in the normal range, you won’t need any medical intervention; however, you should maintain a healthy lifestyle and a healthy weight to prevent hypertension from developing. You may need to be even more cautious about your lifestyle if hypertension runs in your family.
The following recommendations can help you maintain healthy blood pressure:
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