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Leukemia is a cancer of the blood cells. It usually begins in the bone marrow where blood cells are formed. In leukemia, the bone marrow produces abnormal white blood cells. Over time, as the number of abnormal white blood cells builds up in the blood, they replace healthy blood cells. This makes it difficult for the blood to carry out its normal functions. Leukemia can affect anyone at any age, but is more likely to strike the very young and people past 40. The most common side effects include: mouth sores, fatigue, anemia, dizziness, infection, pain, hair loss, and loss of appetite. The advances in treatment options have made the deadly blood cancers into manageable chronic conditions.