Elderly people with low blood pressure in the morning and high blood pressure in the afternoon do not necessarily need to be treated, and should be observed to see if the blood pressure is normal and decide whether to treat it according to the specific reasons, because it may be a normal physiological phenomenon, or it may be related to abnormal neural regulation or the use of antihypertensive drugs. 1. Physiological phenomenon: Normal people’s blood pressure fluctuates 24 hours a day, most people’s blood pressure is lowest in the morning at 2~3 a.m., high in the morning at 6~10 a.m. and in the afternoon at 16~20 p.m., and slowly decreasing since 20 p.m. This “double peaks and double valleys” is the most common cause of blood pressure in the world. This phenomenon of “double peaks and double valleys” is more pronounced in elderly hypertensive patients. If the blood pressure varies within the range of 140/90 mmHg, no treatment is usually needed. 2. Abnormalities in neuromodulation: These may be caused by alternating abnormalities in the sympathetic and vagus nerves during strenuous activity, emotional excitement, or when just waking up from sleep. In this case, it is necessary to adjust the lifestyle, pay attention to rest and relaxation, and if it improves, no treatment is needed. 3. Antihypertensive drug type: for hypertensive patients, to exclude the use of short-acting antihypertensive drugs because of the changes in blood pressure caused by the morning after taking the drug, there will also be a morning low, the drug to maintain the blood concentration time is short, easy to rise in the afternoon blood pressure and the situation. Short-acting antihypertensive drugs are taken frequently, patient compliance is poor, and drug release is not uniform, which can cause large fluctuations in blood pressure. At present, it is generally recommended to take long-acting antihypertensive drugs, long-acting antihypertensive drugs cause less fluctuations in blood pressure, it is recommended to use under the guidance of a specialist. If the blood pressure fluctuates within the range of 140/90 mmHg, no treatment is required. If an abnormal increase in blood pressure occurs, please go to the hospital in time to take targeted treatment measures under the guidance of a doctor, and do not abuse drugs blindly.