Hypertension is the term doctors use for high blood pressure. Most of the time, no cause is identified. This is called essential hypertension. High blood pressure that results from a specific condition, habit, or medication is called secondary hypertension. For example, too much salt in your diet can lead to secondary hypertension. Clinical research involves investigations into the molecular, genetic and environmental causes of high blood pressure and its related conditions. Also includes investigating new therapies to treat patients diagnosed with hypertension.