Aplastic anemia itself does not cause fever in patients; however, individuals with aplastic anemia experience a decrease in all blood cells, including white blood cells, red blood cells, and platelets. A significant reduction in white blood cells, such as in a state of neutropenia, can lower a patient's resistance to infections, which makes it easy for secondary infections to occur and thus induce fever. Furthermore, in cases of severe anemia, severe aplastic anemia can also lead to the occurrence of low-grade fever in patients. On the other hand, a reduction in platelets generally does not cause fever. Therefore, when a patient with aplastic anemia has a fever, it is important to determine the cause of the fever.