Hypertension, or high blood pressure, is defined as a systolic pressure above 140 mm Hg or a diastolic pressure above 90 mm Hg. It is a major public health problem affecting over 60 million Americans. Risk factors include family history, age, gender, ethnicity, stress, obesity, high sodium diet, and low calcium intake. Uncontrolled hypertension can lead to stroke, heart attack, and other cardiovascular diseases. Treatment involves lifestyle modifications and medication to prevent complications from this chronic condition.