Blood pressure is the force of the blood hitting under the passage of the blood vessels. Blood pressure is always given as these two numbers, the systolic and diastolic pressures. A sys-di of 140/90 plus more is diagnosedas high blood pressure, scientifically termed as hypertension. Blood pressure keeps changing at various course of the day. It is usually at the least when the person is relaxing and is at the top level when one is exitable, nervous, or active.
