Hypertensive crisis, now referred to as hypertensive emergency, includes hypertensive encephalopathy. It mainly refers to cases where, under certain triggers, the blood pressure of patients with primary or secondary hypertension suddenly or significantly rises, typically exceeding 180/120 mmHg, accompanied by progressive failure of critical target organs such as the heart, brain, and kidneys. Hypertensive emergencies include hypertensive encephalopathy, cerebral hemorrhage, cerebral infarction, acute heart failure, acute coronary syndrome, aortic dissection, etc. Hypertensive encephalopathy is characterized by symptoms caused by hypertension, such as headache, blurred vision, nausea, vomiting, and severe edema of the head.