What is pre hyper tension?

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Prehypertension - also called "high-normal" blood pressure - affects an estimated 25 percent of American adults, about the same number as those diagnosed with high blood pressure. Prehypertension is systolic pressure between 120 and 139 mmHg over diastolic pressure of 80 to 89 mmHg (hypertension is 140/90 mmHg or higher).The risk of prehypertension can double the risk of heart disease and stroke.