Patients with high blood pressure who have been taking medication but have a sudden increase in blood pressure can be due to the following factors: First, the amount of medication taken is insufficient, and the dose can be increased on the premise of taking it once a day, for example, by changing the oral dose from once a day to twice a day, and observing the effect of the medication. Secondly, another antihypertensive drug can be added on top of the existing medication. Commonly used antihypertensive drugs have five categories, for example, used to take calcium antagonists, at this time you can add ACEI drugs, you can take two drugs at the same time. Thirdly, if there is a sudden increase in blood pressure as mentioned above, it should also be considered that there is an acute target organ function impairment, for example, renal function impairment, cardiac insufficiency or cerebrovascular dysfunction, which can lead to a sudden increase in blood pressure.