High blood pressure, or hypertension, is defined as readings of 140/90 mm/hg or above and often presents few symptoms until serious complications arise. Untreated hypertension can lead to severe health issues like stroke and heart failure, and factors contributing to it include high sodium intake and lack of exercise. Diovan, an angiotensin II receptor antagonist, is a medication that helps lower blood pressure and reduce the risk of heart-related fatalities.