Hypertension, also called high blood pressure, occurs when the force of blood pressing against artery walls is too high. It is measured by a reading with a top systolic number measuring pressure as the heart beats and a bottom diastolic number measuring pressure as the heart relaxes, with normal below 120/80. Over time, uncontrolled hypertension can damage arteries and organs. Lifestyle changes like following a low-sodium diet, exercising regularly, managing stress and weight, and avoiding tobacco can help control blood pressure, and medications may also be needed if lifestyle changes are not enough to lower a high reading. Regular monitoring of blood pressure and any medications is important for management.