Hypertension or High Blood Pressure, physiological condition involving increased pressure on the arterial walls. Generally both the systolic and diastolic pressure are elevated, although diastolic pressure only may be increased. Many people have a condition known as labile hypertension, in which blood pressure is elevated on initial examination but registers normal on subsequent measurements. For this reason a diagnosis of true, or sustained, hypertension requires elevated blood pressure readings on several occasions.
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