How serious is high blood pressure? Very serious. Currently 60 million people living in the United States have high blood pressure. That works out to be 1 in 4 adults. That means you have a 25% chance of having high blood pressure, and means it is almost a certainty that someone you know or love has a problem with high blood pressure. The risk of dying from a heart attack goes up exponentially if you are diagnosed with high blood pressure. Following are some facts you should know regarding high blood pressure . . .