It is often called the "silent killer" because it can damage your heart, kidney, and brain, even though you feel no symptoms. Blood pressure is the force exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. If your blood pressure is normal, you can work with your health care team to keep it that way. If your blood pressure is too high, you need treatment to prevent damage to your body’s organs. High blood pressure is dangerous because...