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Leukemia is a type of cancer that harms the body's ability to make healthy blood cells. It starts in the bone marrow, the soft center of various bones. This is where new blood cells are made. There are three main types of blood cells:
In many cases, people in the early stages of leukemia have no obvious symptoms. When symptoms do appear, they may include: 1  Anemia. 2  Anemia is caused by having a lower than normal number of red blood cells, which slows down the delivery of oxygen to the body's organs and muscles.eukemia is a cancer (an abnormal growth of cells) of the blood and bone marrow. Unlike other cancers, leukemia does not produce a mass (tumor), but results in the overproduction of abnormal white blood cells.