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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:
Because some conditions coincide with the presence of the disease, the following may be signs of leukemia: 1  Anemia: A low red blood cell count. Red blood cells carry oxygen around the body. This condition may contribute to weakness, fatigue or shortness of breath.  Leukopenia: A low white blood cell count.