Introduction The body is made up of various system which include; the cardiovascular system, renal, respiratory, digestive and so on. But I will focus on cardiovascular system. Cardiovascular system consist of heart and the network of vessels in which the blood circulate round the body. The force per unit area which maintain blood flow across the blood is called, blood pressure. Classification Blood pressure is classified into; 1. Systolic blood pressure (SBP) 2. Diastolic blood pressure (DBP) Blood pressure is SBP/DBP e.g 110/70 mmHg. The normal blood pressure is 120/80 What is hypertension? It refers to a persistently elevated blood pressure. The threshold values for a diagnosis of hypertension WHO/ISH (1999 & 2004) Blood pressure greater than or equal to 140/90 mmHg, two or more occasion. ACC/AHA (2017) Blood pressure greater than or equa...