Leukemia is another major type of blood cancer and is diagnosed at a slightly lower rate than lymphoma. Leukemia is caused by bone marrow that is producing abnormal white blood cells too rapidly. This prevents healthy white blood cells from being able to properly fight infections, and keeps bone marrow from producing red cells and platelets, which the body needs for oxygen delivery and other necessary functions.
There are a few kinds of leukemia, which doctors group into acute and chronic types. Children make up a majority of leukemia patients with acute leukemia, which is also its more aggressive form. Chronic leukemia tends ot develop more slowly. Both of those categories are broken into myeloid and lymphocytic types.