Your blood pressure was high enough today to start treatment with medicines. Often healthcare providers don't know what causes high blood pressure (hypertension). But it can be controlled with lifestyle changes and medicines. High blood pressure usually has no symptoms. But it can sometimes cause headache, dizziness, blurred vision, a rushing sound in your ears, chest pain, or shortness of breath. But even without symptoms, high blood pressure that's not treated raises your risk for heart attack and stroke.