The concept of blood pressure refers to the pressure on the walls of blood vessels generated by the flow of blood through them, and is formed by a variety of factors related to the contractility of the heart, adequate blood volume and arterial elasticity. Increased blood pressure is not caused by excess blood in the blood vessels, so blood pressure cannot usually be lowered through blood donation. Although hypertension is not an absolute contraindication to blood donation, there is a certain risk for patients with hypertension to donate blood. During blood donation, the coronary arteries of the heart tend to spasm, which may lead to myocardial ischemia, resulting in angina pectoris. In addition, the drop in blood pressure and slowed blood flow after blood donation may cause acute thrombosis and may easily induce myocardial infarction. In some hypertensive patients, although the blood pressure is normally controlled within the normal range, the blood vessels themselves are less elastic and the abnormal state of regulation is not changed, and blood pressure fluctuations caused by blood donation can also lead to many risks. If a hypertensive patient really needs to donate blood, it must be done under the supervision of medical staff so that abnormal conditions do not occur and the patient can be dealt with promptly.