Under normal circumstances, the blood pressure differential range of 30-40mmHg, are normal, systolic and diastolic blood pressure is too high or too low, there will be an increase or decrease in the pulse pressure differential situation. In general, the situation of increased pulse pressure is relatively common, commonly found in the following groups: 1, the elderly if atherosclerosis, coronary arteries become less elastic and more brittle, then there will be an increase in blood pressure differential. 2, if the patient has aortic valve closure insufficiency, arteriovenous fistula, hyperthyroidism, there will be an increase in pulse pressure differential. 3, patients with acute If the patient has acute pericarditis, pericardial effusion, constrictive pericarditis, etc., there will also be a decrease in the pulse pressure difference.