LYCOS RETRIEVER 
Anemia: Iron
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Anemia diminishes the capability of individuals who are affected to perform physical activities. This is a result of one's muscles being forced to depend on anaerobic metabolism. The lack of iron associated with anemia can cause many complications, including hypoxemia, brittle or rigid fingernails, cold intolerance, impaired immune function, and possible behavioral disturbances in children.
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Anemia affects more than 30 percent of the world's population, and it is one of the most important worldwide health problems. It has a significant [P]revalence in both developing and industrialized nations. Causes of anemia include nutritional deficiencies, particularly of iron, vitamin B12, and folate (folic acid); excess blood loss from menstruation or chronic illness and infection; ingestion of toxic substances, such as lead, ethanol, and other compounds; and genetic abnormalities such as thalassemia and sideroblastosis.
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Anemia may be caused by excessive bleeding. Bleeding may be sudden, as may occur in an accident or during surgery. Often, bleeding is gradual and repetitive, typically from abnormalities in the digestive or urinary tract. Chronic bleeding typically leads to low levels of iron, which leads to worsening anemia.
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