Anemia is a lack of healthy red blood cells. Without enough of these essential components, the blood cannot carry enough oxygen to oxygenate all the organs and tissues in the body. This leads to a variety of complications ranging from mild to severe. There are many types of anemia, but they can all be grouped by their three causes: blood loss, destruction of red blood cells, and faulty or decreased blood cells.
Internal bleeding, a possible result of traumatic injury or gastrointestinal disease, can cause anemia. Excessive bleeding can happen over a short period, or the vessels may lose small amounts of blood over an extended time. If left undetected, conditions like gastritis, ulcers, hemorrhoids, and cancer, as well as unidentified internal injuries, can also bleed and lead to anemia.
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