Patients with hypertension can not be bloodletting, the main reasons include the following: First, peripheral vascular resistance, many patients with hypertension peripheral vascular resistance is increased, the amount of blood flowing from the aorta to the periphery itself is reduced, in fact, the peripheral tissues themselves are in a kind of ischemic and hypoxic state, at this time, if bloodletting is carried out on the patient, resulting in insufficient blood volume, it will aggravate the ischemic state of peripheral tissues, and deteriorate the condition. Deteriorate the condition. Secondly, heart rate increase, some young hypertensive patients, blood pressure increase manifested as heart rate increase, manifested as excessive activation of sympathetic nerves, causing diastolic blood pressure increase mainly hypertension, if the patient for bloodletting, resulting in a relative lack of blood volume, will reflexively further increase the heart rate, especially too fast heart rate combined with blood volume insufficiency, and even have the risk of causing shock.