by Ken Lund
Causes of Hypertension
A blood pressure of 140/90 or higher is considered high blood pressure. Both numbers are important. If one or both numbers are usually high, you have high blood pressure. If you are being treated for high blood pressure, you still have high blood pressure even if you have repeated readings in the normal range.
Causes
About 90% to 95% of hypertension cases, called primary, or essential hypertension, have no known cause. Primary hype
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