Differential blood pressure is usually referred to as differential pulse pressure, and a differential pulse pressure of 20 mmHg falls within the range of normal values. The decrease in pulse pressure difference is related to vascular and disease factors. The normal range of pulse pressure difference is 20~60mmHg. Most of the decrease in pulse pressure difference is seen in young hypertensive patients with elevated diastolic blood pressure. The high pressure of these patients is basically normal, but the low pressure is often higher than 90mmHg, which is related to increased vascular tone, dyslipidemia, obesity and so on. At this time, lifestyle adjustments should be made, such as strengthening exercise, relieving stress, and avoiding late nights. Decreased pulse pressure can also be seen in pericardial effusion, constrictive pericarditis, heart valve disease, heart failure and other patients. If the pulse pressure difference decreases, you should consult a doctor and follow the doctor’s instructions for treatment.