Headaches may be among the first symptoms of hypertension, or high blood pressure. This headache is often located at the back of the head and is usually noted upon arising in the morning. The pain is throbbing or pulsating. This headache is worsened by exercise, straining, or stooping, since these activities raise blood pressure. A diagnosis can usually be made by checking the blood pressure, which is measured as two numbers: The systolic pressure is listed above the diastolic pressure. A normal reading might be 120/80 (systolic/diastolic). The number 120 (millimeters of mercury) is the systolic pressure, which may vary with activity, exertion, or nervousness. In the diagnosis of hypertension, the diastolic number (in this example 80) is especially important. A diastolic pressure exceeding 100-110 mm (millimeters) of mercury is usually present if hypertension is the true cause of the current headaches. For most patients, treatment consists of medication to lower the pressure, and a low-salt diet and weight reduction when indicated. Evaluation and treatment for high blood pressure are by an internist, family physician, or cardiologist.