Possible causes of sudden rise in blood pressure include stimulation by unexpected events, omission or discontinuation of antihypertensive medications, strenuous exercise, disease-induced hypertension, and so on. It is necessary to avoid stimulation, adjust the use of antihypertensive drugs, rest properly and treat the original disease. 1. Stimulation by sudden events, if the blood pressure is normally normal, when encountering some sudden event stimulation, it is easy to have a sudden increase in blood pressure, which is accompanied by excessive emotional excitement, or excessive sadness, nervousness and anxiety. In this case, no treatment is needed, and the blood pressure can return to normal by itself after removing the adverse factors. 2. Omitting or stopping antihypertensive drugs, if hypertensive patients forget to take antihypertensive drugs, or stop taking drugs privately, it may cause blood pressure rebound, sudden increase in blood pressure, even more than the level of high blood pressure before treatment. Be sure to use antihypertensive drugs in strict compliance with medical advice to ensure the stability of blood pressure. 3. Strenuous exercise, after strenuous exercise can cause a sudden rise in blood pressure, but healthy people’s blood pressure fluctuations are generally within the normal range. After resting, the blood pressure can return to the level before exercise. 4. Disease-induced hypertension, such as pheochromocytoma patients, there may be a sudden high blood pressure, antihypertensive drug therapy is not ideal. Surgery is recommended to treat the primary disease and medication to control the blood pressure level. If elevated blood pressure occurs, consult a doctor promptly and follow the doctor’s instructions for treatment.