Causes can be divided into the following groups:
- Decreased production in the bone marrow:
- aplastic anemia
- arsenic poisoning
- cancer, particularly blood cancers
- certain medications
- hereditary disorders (e.g. congenital neutropenia, cyclic neutropenia)
- Vitamin B12 or folate deficiency.
- Increased destruction:
There is often a mild neutropenia in viral infections.
Additionally, there is a condition called morning pseudoneutropenia which might be a side effect of certain anti-psychotic medications.
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