What causes a low white blood cell count?
A low WBC count can be caused by a variety of diseases, disorders and conditions, as well as certain medications. In some cases a cause cannot be found.
Diseases and disorders that can cause a low white blood cell count
A low WBC count can be due to a variety of different conditions that either destroy WBCs or inhibit their production in the bone marrow. These include:
Aplastic anemia (condition in which the bone marrow makes insufficient blood cells)
Bone marrow disease (myelodysplastic syndromes)
Overactive spleen that destroys white blood cells
Rheumatoid arthritis (chronic autoimmune disease characterized by joint inflammation)
Systemic lupus erythematosus (disorder in which the body attacks its own healthy cells and tissues)
Viral infection that affects bone marrow function
Widespread infection that depletes white blood cells
Medications that can reduce the number of white blood cells
A low WBC count can also be caused by medications or medical treatments that you are receiving for an underlying disease, disorder or condition, such as:
Diuretics (“water pills”)
What are the potential complications of a low white blood cell count?
A poorly controlled or untreated low WBC count can be serious and even life threatening due to increased vulnerability to potentially life-threatening infectious diseases, such as:
Bloodstream infection (sepsis)
Methicillin-resistant Staphylococcus aureus (MRSA) infection
Life-threatening complications of these diseases include:
Recurrent and resistant infections that are difficult to treat
- Septic shock
- WBC count. Medline Plus, a service of the National Library of Medicine National Institutes of Health. http://www.nlm.nih.gov/medlineplus/ency/article/003643.htm.
- What is Aplastic Anemia? National Heart Lung and Blood Institute Diseases and Conditions Index. National Institutes of Health. http://www.nhlbi.nih.gov/health/dci/Diseases/aplastic/aplastic_whatis.html.
- Explore Blood Tests. National Heart Lung and Blood Institute Diseases and Conditions Index. National Institutes of Health. http://www.nhlbi.nih.gov/health/dci/Diseases/bdt/bdt_types.html.
What is a low white blood cell count?
A low white blood cell (WBC) count is a decreased number of white blood cells (leukocytes) in the blood. A low WBC count is referred to medically as leukopenia.
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What other symptoms might occur with a low white blood cell count?
A low WBC count may be accompanied by other symptoms, which vary depending on the underlying disease, disorder or condition. Symptoms can include:
Recurrent infections that are difficult to treat
- Read more about low white blood cell count symptoms