There are two kinds of symptoms of hemolysis of blood type O and blood type A: 1. One is acute hemolysis. Acute hemolysis commonly occurs when type O and type A blood is transfused with the wrong blood type, and the patient suddenly has chills, chills, high fever, and back pain during the transfusion. Hemoglobinuria and soy-like urine may also occur, and in severe cases, oliguria, urinary closure, acute renal failure, and even disseminated intravascular coagulation may occur. Patients show a drop in blood pressure and cold extremities. The other is delayed hemolysis, which can occur after a certain period of time after the transfusion, when the patient gradually becomes pale and anemic, with yellowing of the sclera and skin, and sometimes accompanied by enlargement of the liver and spleen.