4. Leukemia and Other Blood Disorders
Certain types of blood cancers, such as leukemia or myeloproliferative disorders, can result in an abnormally high WBC count. In leukemia, for example, there is an overproduction of immature white blood cells, which crowds out normal blood cells and impairs the immune system. This can lead to a markedly elevated WBC count, sometimes in the hundreds of thousands per microliter.



