In the past, there were cases where people gave blood transfusions to leaders, friends, relatives and others for the purpose of “increasing nutrition” and “strengthening resistance” during their treatment, but it was not what they wanted and they did not want to infect them with certain diseases. It has become increasingly clear that many diseases can be transmitted through blood transfusions, and that blind blood transfusions can cause many unnecessary problems and even irreversible errors. First of all, blood transfusions can transmit many diseases: the most dreaded AIDS, which is probably better known by now. There are also hepatitis B and C, which are extremely difficult to cure, and some of them may turn into liver cancer. There is also syphilis, malaria, and so on. Some people say: Won’t people who donate blood be screened? Yes. However, if a donor has been infected with hepatitis or AIDS and there are no detectable serological changes in his body (this stage is called the window period), it is entirely possible for the recipient to be infected with hepatitis or AIDS once he has been given such blood products. Such examples have been seen time and again. In addition, many problems can occur during a blood transfusion: transfusions can be incompatible with blood types, blood type errors causing hemolysis, and kidney failure; some recipients are allergic to certain components of the imported blood and can quickly develop hives, hyperthermia, and circulatory reactions; transfusions cause a circulatory overload that can lead to heart failure in people with an incompetent heart or in the elderly; large transfusions or stale blood can lead to a reaction to blood preservation Component detoxification of citric acid or potassium, ammonia toxicity, acidemia. After transfusion, hemolytic reaction, immune reaction, post-transfusion purpura, thrombophlebitis, and iron heme deposition may occur. Blood transfusion in tumor patients also causes immune deficiency, which increases the risk of tumor recurrence and metastasis.