Millimeters of mercury is the measure used to represent blood pressure readings; and the normal blood pressure reading in adults is found to be 120/80mmHg (MedicinePlus). During each heartbeat, the blood pressure fluctuates between a systolic (maximum) and diastolic (minimum) pressure. The blood pressure of an individual is expressed by writing systolic pressure over diastolic pressure; for instance 130/80mmHg. The systolic pressure would be high if it is over 140 whereas it is said to be normal if the rate lies below 120. Similarly, diastolic pressure would indicate a normal rate if it is below 80 most of the time. When a person’s systolic pressure usually indicates a value between 120 and 139 and diastolic pressure lies between 80 and 89 most of the time, he is more likely to develop high blood pressure. Causes of hypertension According to the Center for Disease Control and Prevention, the determining factors for hypertension include the level of salt and water in the body, the level of different body hormones, and condition of kidneys, blood vessels, and nervous system. It has been observed that older persons are more likely to develop high blood pressure since blood vessels become stiffer over time. Medical science has proved that high blood pressure may often lead to stroke, heart failure, kidney disease, and early death.