Low blood pressure in the morning and high blood pressure in the evening may be caused by sympathetic nerve excitation, blood pressure fluctuation, improper use of medication, and the cause of the disease should be identified in a timely manner. 1. Sympathetic nerve excitation at night may lead to higher blood pressure at night, but usually does not lead to low blood pressure in the morning. Consultation with the relevant department is recommended. 2. It is possible that the fluctuation of blood pressure is of the nocturnal elevation type, which may be related to the fluctuation of hormone levels in the patient’s body. For patients with elevated blood pressure at night, the probability of cardiovascular and cerebrovascular diseases increases significantly, and the patient’s blood pressure curve may be inverted arytenoid. 3. It may also be caused by improper use of medication, taking short-acting antihypertensive drugs or taking insufficient dosage to cause blood pressure instability, blood pressure concentration at night is not enough to control blood pressure, blood pressure can appear high at night, low in the morning. If these situations occur, you should consult a doctor to clarify the cause of the disease and conduct appropriate examinations if necessary.