High blood pressure, also called hypertension, is defined as a blood pressure reading of 140/90 mm/Hg or above. If left untreated, chronic high blood pressure can lead to serious health problems such as stroke, kidney failure, heart failure, heart attack, and vision loss. Potential causes of high blood pressure include sodium intake, lack of physical activity, alcohol consumption, and use of certain medications. Treatment options include medications like Diovan which works by preventing blood vessels from narrowing to lower blood pressure and improve blood flow.