Elevated blood pressure in patients at night is associated with a variety of factors, which may be physiological or pathological phenomena, as follows: 1, physiological phenomena: for normal people and patients with hypertension, the conventional type of blood pressure fluctuation is arytenoid blood pressure, and some people may have anti-arytenoid blood pressure, which is manifested as low blood pressure during the day and elevated blood pressure at night, so elevated blood pressure at night may be caused by the type of blood pressure fluctuation. 2, pathological phenomena: elevated blood pressure in patients at night may be caused by irregularities in work and rest. In summer, blood pressure is often elevated at night due to late sleep and fatigue at night. In addition, the elevation of blood pressure at night may also be due to the fact that the antihypertensive drugs taken during the day are short-acting antihypertensive drugs, which do not cover 24 hours of smooth blood pressure reduction, so the phenomenon that blood pressure control during the day is still possible, but the blood pressure rises at night. It is recommended to give 24-hour ambulatory blood pressure monitoring and adjust the type, dose and duration of antihypertensive drugs if necessary.