The reason why blood pressure is normal in the morning and high in the afternoon may be due to the inapplicability of antihypertensive drugs, normal fluctuation of blood pressure and over exertion. 1. Inapplicability of antihypertensive drugs: After taking antihypertensive drugs in the morning, the effect of the drugs will be seen immediately and the blood pressure will return to the normal value, but due to the inapplicability of antihypertensive drugs, the drugs will not be stabilized for a long period of time, and then the blood pressure will be elevated in the afternoon. 2. Normal fluctuations in blood pressure: most people’s blood pressure is a double ladle type, there will be two blood pressure higher two peak periods a day, there will be a peak blood pressure in the early morning hours, after the blood pressure returns to normal in the afternoon, there will be a second peak blood pressure, will lead to a normal blood pressure in the morning, the afternoon is high due to the fluctuations in the law of change in line with the blood pressure. 3. Excessive exertion: the body’s control of vascular tension related hormone levels rise, resulting in increased blood pressure. At the same time, anxiety, mental tension, can cause a transient increase in blood pressure. If the long time high blood pressure, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.