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2. Anemia

People with anemia are more prone to fatigue than dizziness, although some complain of the latter as well. Anemia may lead to a deficiency in red blood cells that carry oxygen to the brain, thus causing lightheadedness. Alternately, a Vitamin B12 deficiency may cause anemia and the production of abnormally large and dysfunctional red blood cells, again impeding oxygen-rich blood flow to the brain.

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