A normal blood pressure reading falls between 90/60 mm Hg and 120/80 mm Hg. Readings above 120/80 but below 140/90 are considered elevated and may signal prehypertension. Anything over 140/90 is classified as high blood pressure, or hypertension, which raises the risk of cardiovascular problems. Levels below 90/60 are considered low blood pressure and may cause symptoms like dizziness or fainting.

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