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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:
Acute leukemia happens when most of the abnormal blood cells stay immature and canât carry out normal functions. It can get bad very fast. Chronic leukemia happens when there are some immature cells, but others are normal and can function normally. That means it gets bad, but more slowly.