how to know if my blood pressure is high or low?
['Normal: A systolic pressure below 120 with a diastolic pressure below 80.', 'Elevated: A systolic pressure of between 120 and 129 with a diastolic pressure below 80.', 'High blood pressure (hypertension stage 1): A systolic pressure of between 130 and 139, or a diastolic pressure between 80 and 89.']