High blood pressure in the afternoon is mostly considered to be caused by normal phenomena, poorly controlled primary hypertension or secondary hypertension. It should be treated under the guidance of a doctor by improving lifestyle habits and adjusting antihypertensive drugs. 1. Normal phenomenon, under normal circumstances, people’s blood pressure will be high in the afternoon, which is a normal physiological phenomenon, generally do not need special treatment. As human blood pressure fluctuates within 24 hours, and there is a trough and two peaks within 24 hours. The second peak is at 14:00~16:00 in the afternoon, so the phenomenon of high blood pressure in the afternoon will occur. 2. Poor control of primary hypertension is mostly due to the patients’ failure to follow the doctor’s instructions to take medication regularly, or the medication maintenance time is shorter, and the patients are not able to maintain the control of their blood pressure in the afternoon after taking antihypertensive medication in the morning, which causes the fluctuation of blood pressure. It is recommended that patients take medication regularly, or consult a doctor in time to adjust the taking of antihypertensive drugs. 3. Secondary hypertension is usually caused by renal diseases, such as renal vascular hypertension, renal hypertension and endocrine abnormalities. Under the guidance of the doctor, actively treat the primary disease, can be combined with the application of antihypertensive drugs to control blood pressure smoothly. Warm reminder: If the blood pressure is persistently high, or accompanied by physical discomfort, it is necessary to consult a doctor in time to avoid delaying the condition and affecting the treatment.