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Blood pressure is the force of blood pushing against artery walls and is measured in milligrams of mercury (mgHg). It is defined by two numbers - the systolic pressure when the heart beats and the diastolic pressure between beats. There are different categories for adult blood pressure ranging from normal to prehypertension to hypertension based on systolic and diastolic levels. Since high blood pressure often has no symptoms, it needs to be tested using a sphygmomanometer and stethoscope. Prevention tips include eating a healthy diet low in fat and high in fruits and vegetables, maintaining a healthy weight, and exercising regularly.Read less