http://www.almotamar.net صحيفة إلكترونية يومية تصدر عن حزب المؤتمر الشعبي العام (اليمن) http://www.almotamar.net/2313.htm 2007-04-07 High blood pressure is abnormally high blood pressure with no known cause. Blood pressure measurements are read as two numbers. The higher number is called the systolic pressure. The lower number is called the diastolic pressure. Normal systolic pressure is 120 or less, and normal diastolic blood pressure is 80 or less.