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Neutropenia

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Neutropenia

Neutropenia is an abnormally low number of neutrophils in a person's blood. A neutrophil is a type of white blood cell that helps protect the body against infection by destroying bacteria.

Neutropenia may be caused by certain cancers, exposure to radiation, some kinds of infection (such as HIV infection), a lack of vitamin B12 or folic acid, an autoimmune disease (such as lupus), or treatment for certain diseases (such as chemotherapy for cancer).

Current as of: May 1, 2026

Author: WebMD Ignite Staff

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This information does not replace the advice of a doctor. WebMD Ignite, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

NOTICE: This health information was not created by Columbia University Irving Medical Center and may not necessarily reflect specific CUIMC practices. For medical advice to your personal condition, please consult your doctor. Medical advice disclaimer.