The normal pulse pressure differential is between 30-40 mmHg. Excessive systolic or low diastolic blood pressure may cause an increase or decrease in pulse pressure differential. An increased differential pulse pressure is commonly associated with aortic sclerosis, aortic valve insufficiency, arteriovenous fistula, and hyperthyroidism. A decrease in pulse pressure difference is common in pericardial effusion, constrictive pericarditis, or peripheral circulation failure. Therefore, it is important to closely monitor the changes in blood pressure and treat them promptly. When using medication, it is also important to pay attention to the adverse effects of antihypertensive drugs and any potential complications. When monitoring blood pressure, you must do four things: fix the sphygmomanometer, fix the position, fix the site, and fix the time. Maintain adequate sleep, reduce activity and pay attention to rest.