It refers to the pressure exerted by flowing blood on the arterial walls. The difference in blood pressure between two points is what helps your blood flow. Mean blood pressure decreases as we move away from the heart. Very high or low blood pressure usually indicates some sort of health problem. High BP or Hypertension indicates that the heart is working too hard and is linked to strokes, heart attacks, aneurysm and chronic kidney disease. Low BP (hypotension) on the other hand leads to vital organs not getting enough oxygen or blood.