When your heart beats, it pumps blood into the arteries. Blood pressure is the strength of your blood pushing against your artery walls. Low blood pressure occurs when blood pressure is lower than usual(at a rate of 90/60 beats per minute or lower).When you have low blood pressure, your heart, brain and other parts of the body do not get enough blood. Low blood pressure can cause dizziness, fainting or shock.
Attribution: Straight Talk Foundation