Leukemia begins in the bone marrow, where the body creates blood cells. Immature white blood cells mutate and become abnormal. There are several types of leukemia, each with similar symptoms but different prognoses. A buildup of abnormal cells and their failure to carry out their intended functions cause the symptoms of this condition. People with leukemia experience fever, swollen spleen and liver, frequent infections, weight loss, night sweats, fatigue, mouth sores, and blood clotting disorders.

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