If you have high blood pressure, it means the force of your flowing blood against vessel walls is consistently high. This can put stress on your heart and damage your arteries in the process, leading to a buildup of plaque, which narrows your arteries even further. A clot or blockage can result and prevent oxygenated blood from reaching your heart, causing a heart attack. Right now, nearly 50 percent of Americans have high blood pressure. Get your blood pressure screened regularly and use these tips to keep your numbers in check.