The sudden appearance of hypotension in elderly people with hypertension should consider the following possibilities: 1. postural hypotension or postprandial hypotension, elderly patients with hypertension have high blood pressure fluctuations and are very prone to hypotension, so they should avoid too fast, excessive postural changes or eating too much; 2. oral antihypertensive drug overdose, there is excessive anxiety when elderly people take drugs to lower blood pressure, they are afraid of accidents, and once the blood pressure is measured too high they The elderly should gradually increase or decrease the dose of drugs under the treatment of tolerating blood pressure lowering; 3. Hypotension caused by low blood sugar; 4. Other causes of shock, such as acute myocardial infarction, acute heart failure caused by cardiogenic shock, such as long-term poor feeding and resulting in hypovolemic shock.