First, the impact of sleep; Second, drinking causes reflex blood pressure increase; Third, a fluctuation in the patient's mood, trauma or angry quarrel, which will cause a sudden increase in blood pressure. In addition to these functional factors, the patient's blood pressure suddenly increases or fluctuates greatly. We should consider such factors as pheochromocytoma, or renal artery stenosis, which cause fluctuating or reflexive increases in blood pressure. The patient's sudden increase in blood pressure is accompanied by increased heart rate and sweating. In this case, we should go to the hospital in time.