As an expert in the field of hematology, I can explain that cancer in the blood, also known as leukemia, occurs when there is a mutation in the DNA of the blood cells, particularly the white blood cells. This mutation can be caused by various factors, including exposure to certain chemicals, radiation, or certain viruses. It's important to note that not all leukemia is caused by these external factors; in many cases, the cause is unknown and is thought to be due to spontaneous mutations that occur during the normal process of cell division. When the DNA of a blood cell is altered, it can lead to the uncontrolled growth and division of these cells. Unlike normal white blood cells, which are produced to help fight infections, the abnormal cells produced in leukemia do not function properly. They accumulate in the bone marrow and bloodstream, crowding out healthy blood cells and impairing the body's ability to fight infections and to produce the oxygen-carrying red blood cells and clot-forming platelets that are essential for health. read more >>

Leukemia, a type of cancer found in your blood and bone marrow, is caused by the rapid production of abnormal white blood cells. The high number of abnormal white blood cells are not able to fight infection, and they impair the ability of the bone marrow to produce red blood cells and platelets.read more >>