What is hypertension? Why is it caused? What harm can it do?

Hypertension is the other name of high blood pressure. High blood pressure is caused when there is constriction in arteries called arterioles. Arterioles regulate the blood flow through our body. As these arterioles constrict, the heart has to work harder to pump the blood through the smaller space. Due to this, the pressure inside the vessels grows. A very high blood pressure can lead to the rupture of artery and internal bleeding.