When the blood pressure of a patient with hypertension suddenly becomes low, then one must be alert to the fact that it is likely to be aggravated. First of all, we must maintain the blood pressure within a safe range, for example, the systolic pressure can be maintained above 90 mmHg and the diastolic pressure can be maintained above 60 mmHg. Depending on the degree of blood pressure reduction, choose to apply different medications to maintain blood pressure, and while maintaining blood pressure, make sure to identify the cause of the drop in blood pressure. So what exactly can trigger hypertension to suddenly become hypotension? To rule out whether the patient is an overdose of antihypertensive drugs, especially elderly patients, sometimes for the dose of medication or not, is not very clear, easy to repeat the medication, so it can lead to excessive lowering of blood pressure. If hypertension suddenly becomes hypotension due to this cause, it is generally not a big problem, and blood pressure can gradually return to normal after 24 hours. Patients with hypertension who have sudden acute inferior wall myocardial infarction or right ventricular myocardial infarction are often accompanied by hypotension, so it is not recommended to take antihypertensive drugs in the near future, observe the changes in blood pressure, and give rehydration therapy as appropriate. Clinically commonly used are polarizing fluid, and low molecular dextrose for better maintenance of blood pressure, while like polarizing fluid can maintain cell membrane stability and prevent arrhythmias, while low molecular dextrose can improve microcirculation in addition to volume expansion. In addition to the above reasons, when acute heart failure occurs in hypertensive patients, a transient drop in blood pressure may also occur. In addition, hypotension may be caused by a cachectic state in hypertensive patients, such as poor feeding, severe anemia, or severe blood loss. Patients with hypertension should pay attention to regular oral antihypertensive medication on a regular basis, and also regularly monitor their blood pressure. When blood pressure decreases, the dosage should be reduced or discontinued in a timely manner, but it is best to go to the hospital and be guided by a professional doctor before reducing or discontinuing the dosage.