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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:
People with leukemia often look pale because of anemia. Anemia is a condition in which the body has a low amount of red blood cells. Without enough red blood cells to carry oxygen to the body, anemia can cause symptoms such as: 1  fatigue.  weakness.