There are several common reasons for high low blood pressure at night: 1, inaccurate measurement of blood pressure; 2, excessive volume load and pseudo-resistance, such as excessive sodium intake, sodium retention caused by renal disease, and inadequate treatment with diuretics; 3, reasons related to the application of medications, such as poor patient compliance, failure to adhere to the medication, low dosage of medications, insufficient combination of medications, as well as the taking of medications that may affect lowering blood pressure, such as traditional Chinese medicines, supplements to food, and so on; 4, concomitant with other conditions, such as obesity, smoking, and alcohol overdose, and so on; 5, simple clinic hypertension, and the above reasons need to be ruled out one by one.