Whether aplastic anemia is severe depends on the specific circumstances of the aplastic anemia. Aplastic anemia can be divided into acute aplastic anemia and chronic aplastic anemia. Among them, acute aplastic anemia has a sudden onset, more severe clinical symptoms, and a higher mortality rate, so it is relatively more severe. Chronic aplastic anemia has a slower onset, and the degree of decrease in blood cells is relatively mild, also making it less severe. However, in cases of acute aplastic anemia, if intensive immunotherapy is administered, the effectiveness can reach 60%-70%, and it can be cured through hematopoietic stem cell transplantation.