Today (May 17) is World Hypertension Day, and the American Medical Association is encouraging people to monitor their blood pressure levels and get high blood pressure, or hypertension, under control. High blood pressure, sometimes referred to as the "silent killer" because there aren't always symptoms, can damage blood vessels and increase the risk of heart attack, stroke and more. To learn more about your numbers and how to reduce your risks, visit the American Heart Association website at loweryourhbp.org.