Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hypertension, better known as high blood pressure is a condition in which the pressure in the arteries is too high. The disorder is very common, especially in middle-aged and elderly people, affecting not only the heart and circulatory system, but also causing damage to many parts of the body. Nicknamed "the silent killer" as it often causes no symptoms for many years and decades, leading to a fatal outcome, hypertension is very widespread, affecting more than 73 million American adults and nearly 1 billion people worldwide. Learn more about hypertension and its prevention in this book.