Pulse pressure is also known as pulse pressure, which is the difference between systolic and diastolic blood pressure. For example, the measured blood pressure is 120/80 mmHg, the pulse pressure is 40 mmHg. The pulse pressure under normal conditions is 30-40 mmHg, and the change in pulse pressure is related to age, gender and some diseases. Under normal circumstances, age increases, arterial blood pressure gradually increases, and the rise in systolic pressure is more significant than the rise in diastolic pressure, so the pulse pressure in the elderly is greater than that of young people. The elasticity of the wall of the aorta has the effect of buffering changes in arterial blood pressure, which means that it has the effect of reducing pulse pressure. During arterial changes, an increase in pulse pressure can also result from the proliferation of vascular collagen fibers that gradually replace smooth muscle and elastic fibers. A pulse pressure of less than 30 mmHg is called a reduced pulse pressure. Decreased pulse pressure can be seen in heart failure, pericardial effusion, etc. The onset of hypertension is usually associated with an increase in peripheral vascular resistance. When peripheral vascular resistance changes, it has an effect on both systolic and diastolic blood pressure, but the effect on diastolic blood pressure is more significant. As resistance in the arteries increases, arterial blood flow slows, so more blood is retained in the arteries during diastole, resulting in an increase in diastolic blood pressure and thus a decrease in pulse pressure. Many patients with hypertension may have experienced that as they age, some of them have normal or near-normal diastolic blood pressure, while the systolic blood pressure does not change significantly or increases, resulting in an increase in pulse pressure, which can be easily mistaken as an improvement in hypertension, but in fact this is another reflection of the different degrees of atherosclerosis.