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It is a shortage of red and white blood cells- the bone marrow- for some reason- is not making the cells. Pancytopenia occurs in two forms: idiopathic, in which the cause is not known, but is often autoimmune, meaning that the body attacks its own tissues as foreign substances; and secondary, often caused by environmental factors. Approximately half of all pancytopenia cases are idiopathic. In other cases, viral infections, radiation or chemotherapy treatments, drug reactions, and exposure to toxins may precipitate the development of pancytopenia.

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Q: What causes pancytopenia?
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