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www.reference.com/article/causes-blood-pressure-60213c71456184b4

Blood pressure is caused by the force of the blood as it pushes against artery walls, according to WebMD. This pressure is measured during the active and resting phases of every heartbeat.

www.reference.com/article/low-blood-pressure-1187ada3b7ccfd23

Low blood pressure, or hypotension, occurs when a person's blood pressure measures below 90 for systolic and 60 for diastolic, according to WebMD. Having just one number below these given figures is enough for a person to have hypotension.

www.reference.com/article/normal-blood-pressure-38dbcc1737764139

According to About.com, normal blood pressure is 120 millimeters of mercury during a heart contraction and 80 millimeters of mercury during relaxation. This results in blood pressure readings in the range of 120/70 to 140/90. Blood pressure readings that surpass that am...

www.reference.com/article/considered-good-blood-pressure-a56732bd598ac468

A blood pressure reading below 120/80 mm Hg is a good blood pressure reading, according to the National Heart, Lung, and Blood Institute. Low readings are usually best, but the American Heart Association warns that low blood pressure can cause unpleasant side effects, s...

www.reference.com/article/causes-high-blood-pressure-8fcc098e7658cad4

According to Mayo Clinic, primary hypertension, or high blood pressure, has no identifiable causes and develops over time. Medical conditions such as chronic kidney disease, thyroid disease, sleep apnea, congenital blood defects and adrenal gland tumors are causes of se...

www.reference.com/article/blood-pressure-measure-1aaf4beb3715392a

Blood pressure represents the pressure of blood in the arteries as the heart contracts and when it is at rest, according to WebMD. The pressure in the arteries right after the heart contracts is called systolic blood pressure, and the pressure when the heart rests is ca...

www.reference.com/article/blood-pressure-affect-6c26aa63b1bee8b1

Blood pressure affects the vital organs and the health of the arteries, as reported by the American Heart Association. Someone with consistently elevated blood pressure has an increased risk for arterial damage, blood clots and organ damage.