For patients with hypertension, if the blood pressure is suddenly normal and low, the following points should be considered: First, consider whether the patient has overdosed on antihypertensive medication and the blood pressure is suddenly normal and low, for example, if the dose is increased to twice a day after taking it once a day, such a situation is likely to occur. Second, for hypertensive patients who have some acute cardiovascular conditions, such as coronary artery disease unstable angina or acute coronary syndrome, there will be a sudden normal low blood pressure, accompanied by chest tightness, shortness of breath, palpitations, precordial discomfort and a series of symptoms. Thirdly, if the type and frequency of antihypertensive drugs are wrong, such as taking one antihypertensive drug once a day in the past, if the combination of a variety of antihypertensive drugs, it will also lead to a sudden normal blood pressure, or low blood pressure.