Pernicious anemia

A type of anemia (low red blood cell count) caused by the body’s inability to absorb vitamin B12 due to the lack of intrisic factor which is  needed for the absorption. Because vitamin B12 is needed by nerve cells and blood cells for them to function properly, deficiency can cause a wide variety of symptoms, including fatigue, shortness of breath, tingling sensations, difficulty walking, and diarrhea.

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