Blood pressure readings
Wrist blood pressure monitors.

This should help you make sense of blood pressure readings displayed on wrist blood pressure monitors or given to you by your doctor.

	Rating Systolic Diastolic Optimal < 120 < 80 Normal < 130 < 85 High Normal 130-139 85-89 Hypertension 140-159 90-99 Stage 1 Hypertension 160-179 100-109 Stage 2 Hypertension > 179 > 109 Stage 3

The blood pressure readings are a measurement of air pressure reponding to the pressure on arteries from the blood coming from your heart.
Historically the blood pressure readings figures relate to the height in mm - millimeters of a column of mercury