Hypertension is characterized by elevated arterial blood pressure in the systemic circulation, and may be accompanied by functional or organic damage to organs such as the heart, brain, and kidneys. Hypertension can be divided into primary hypertension and secondary hypertension. Secondary hypertension is due to certain identified causes or etiologies, leading to increased blood pressure, accounting for about 5% of all hypertension cases. Conditions like primary aldosteronism, pheochromocytoma, renovascular hypertension, and renin-secreting tumors are examples, and cases where the cause of increased blood pressure cannot be found are also referred to as primary hypertension and hypertensive disease. Currently, the classification and standard for blood pressure in China mostly use a systolic pressure of greater than or equal to 140 mmHg and/or a diastolic pressure of greater than or equal to 90 mmHg.