What is hypertension?
Blood pressure is the force of blood pushing against blood vessel walls. The heart pumps blood into the arteries (blood vessels), which carry the blood throughout the body. High blood pressure, also called hypertension, is dangerous because it makes the heart work harder to pump blood to the body and it contributes to hardening of the arteries or atherosclerosis. There are several categories of blood pressure. People whose blood pressure is above the normal range should consult their doctor about methods for lowering it.