Low blood pressure in the morning and high blood pressure in the afternoon are related to the rhythmic nature of blood pressure and the type and duration of medication. If the blood pressure is too low or too high, it is recommended to adjust the time of taking medication or change the medication program according to the cause of the disease and the doctor’s advice based on the characteristics of your own blood pressure. 1. The rhythm of blood pressure itself: most people have low blood pressure in the morning and high blood pressure in the afternoon is a normal phenomenon, normal blood pressure fluctuations in the day and night of the day rhythm, that is, the lowest blood pressure in the early morning 2 ~ 3 a.m., the morning 6 ~ 10 a.m. and the afternoon 4 ~ 8 p.m. blood pressure each has a peak in the evening, 8 p.m. from the slow decline in blood pressure, which is related to the regularity of the human body’s sympathetic nerve excitation. This is related to the regularity of the body’s sympathetic nervous excitement. Therefore, as long as the blood pressure varies within a certain range, it is a normal phenomenon. 2. The type and time of medication taken: If you are a hypertensive patient and take short-acting antihypertensive medication in the morning after waking up, you may also experience low blood pressure in the morning and high blood pressure in the afternoon. Therefore, you need to follow the doctor’s instructions according to the characteristics of their own blood pressure to adjust the time of taking medication, it is generally recommended to take short-acting antihypertensive drugs in time when the blood pressure rises. 3. In addition, you can go to the hospital to replace the long-acting antihypertensive drugs, such as enalapril, felodipine, nifedipine extended-release tablets, etc., to alleviate the situation of low blood pressure in the morning. Patients with high blood pressure should pay attention to adjusting their diet, work and rest, and regularly monitor their blood pressure to ensure that it is stable. If there is a need to change antihypertensive drugs, the instructions of the drugs must be strictly adhered to, and it is best to do so under the advice and guidance of a professional doctor.