The common adverse reactions to blood transfusion are: febrile reactions, which are one of the most common reactions to blood transfusion. Patients often have elevated body temperature during transfusion, and in severe cases, chills, chills and high fever may occur. The cause of a febrile transfusion reaction may be related to the presence of pyrogen in the transfused blood, or sometimes to improper storage and handling of the blood. After a febrile reaction occurs, first stop the transfusion, give the patient warmth, oxygen and other symptomatic treatment, and at the same time examine the remaining blood to find the cause of the fever. Allergic reactions are also one of the common adverse reactions to blood transfusion, often occurring during or after the transfusion. Patients may develop symptoms such as itchy skin, rash, and in severe cases, symptoms of anaphylaxis such as tracheal spasm and decreased blood pressure, which often require emergency treatment.