High blood pressure is generally not allowed to donate blood. According to China’s law, hypertensive patients are not allowed to donate blood, because the blood pressure of hypertensive patients is not normal, and donating blood will easily lead to a sharp rise in blood pressure within a short period of time, thus inducing cardiovascular and cerebrovascular diseases. Moreover, hypertensive patients often need to take oral antihypertensive drugs for a long period of time, and there will be certain drug components in the blood, which may lead to low blood pressure due to the residual drug in the recipient after the blood transfusion. Therefore, hypertensive patients are not allowed to donate blood, especially those of advanced age. Hypertensive patients should take antihypertensive drugs on time and change their bad dietary habits, paying attention to low-salt and low-fat diet.