Anesthesia produces hypertension for the following reasons: 1, when the anesthesia is too shallow or the analgesia is incomplete, it will cause the patient’s blood pressure to increase and the heart rate to increase due to surgical stimulation. Then, the trauma and pain after surgery are also the causes of postoperative hypertension.2. Operations under light anesthesia, such as tracheal intubation, are common causes of hypertension during the induction period of anesthesia, and operations such as tracheal extubation during the awakening period of anesthesia and endotracheal suctioning can also cause an increase in blood pressure.3. Hypoxia and carbon dioxide accumulation during the operation are also common reasons for the occurrence of high blood pressure. Carbon dioxide accumulation or hypoxia stimulates the chemoreceptors in the aortic body or carotid body, which reflexively excites the cardiovascular center of the medulla oblongata, causing the blood pressure to rise and the heart rate to increase, and severe hypoxia causes circulatory inhibition. The anesthesiologist will keep the patient’s blood pressure stable during surgery to ensure that the patient’s vital signs are stable, so as to ensure the safe and smooth operation.