One cause of low red blood cell count is pregnancy, but this is normal, according to Mayo Clinic. However, among the many other conditions and diseases that can cause a low red blood cell count are cancer, aplastic, vita... More »

Equine infectious anemia causes a low red blood cell count in horses, according to the North Carolina Department of Agriculture and Consumer Services. This is a contagious viral disease that can result in death. More »

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Oxygen attaches to hemoglobin in the blood that carries it to other tissues, so when the red blood cell count is low, the blood oxygen levels also drop. When a person does not have enough healthy red blood cells, he is a... More »

A normal red blood cell count for males is 4.7 to 6.1 million cells per microliter, and a normal count for females is 4.2 to 5.4 million cells per microliter, states MedlinePlus. Normal ranges may vary from lab to lab, a... More »

Because there are so many underlying causes for a low white blood cell (WBC) count, treatment options are dependent on the specific cause. For example, a cause for a low white blood cell count can be many different disea... More »

A white blood cell count below the normal range may be a symptom of cancer, a viral infection, an autoimmune disease or another cause, states Mayo Clinic. Identifying the exact cause is done through other tests. As the e... More »

A congenital or autoimmune disorder, cancer, a viral infection, an overwhelmingly strong infection, or certain drugs may cause a low white blood cell count, Mayo Clinic advises. Damage to bone marrow, which produces whit... More »