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High blood pressure is a serious and often silent threat to cardiovascular health. It plays a key role in how blood circulates to the heart, brain, kidneys, and other organs. Blood pressure charts provide information on the different blood pressure ranges, including normal, low, and high blood pressure . Knowing the different ranges can help you understand your blood pressure readings and take steps to maintain a healthy lifestyle. What is high blood pressure or hypertension? The American Heart Association provides information on high blood pressure , low blood pressure, and how to monitor, treat and prevent high blood pressure . Blood pressure higher than 180/120 mm Hg is considered a hypertensive emergency or crisis. Seek emergency medical help for anyone with these blood pressure numbers. Untreated, high blood pressure increases the risk of heart attack, stroke and other serious health problems.