Blood Pressure Essentials Explore What is Blood Pressure? Blood pressure measures the force of circulating blood on the walls of blood vessels, which is crucial for heart and circulation function. HypertensionKey Facts Have Hypertension M Take Prescription Medication M Untreated M Undertreated M Reliable Sources for Information American Heart Association National Institute of Health Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus pulvinar dapibus leo. WebMD Cleveland Clinic