A large pressure difference refers to an increase in the difference between systolic and diastolic blood pressure in blood pressure compared to the previous one. It may be due to a simple increase in systolic blood pressure or a decrease in diastolic blood pressure or both, and its essence is due to a sudden increase in blood pressure or a weakening of vascular elasticity. When a sudden increase in blood pressure systolic pressure causes dizziness, oral antihypertensive drugs can be taken immediately to dilate the blood vessels and lower the systolic pressure, and when the blood pressure is lowered, the dizziness symptoms can generally be relieved. When there is a large differential pressure in the elderly, some people may not have a significant increase in systolic blood pressure, but their diastolic blood pressure is not elevated. At this time, it is mainly due to the weakening of vascular elasticity, and the acute phase can be relieved by antihypertensive drugs first, and then combined with RAAS system inhibitors, such as ACEI and ARB drugs, but the activity must be reduced first to avoid cerebral hemorrhage during exercise.