Anemia is a condition in which a person's blood lacks a sufficient number of healthy red cells. Without enough red blood cells, your blood cannot carry enough oxygen. This can lead to a variety of complications that range 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, which may result from gastrointestinal diseases, can cause anemia. Excessive bleeding can happen over a short period of time, or small amounts of blood may be lost over an extended period of time. If left undetected, conditions like gastritis, ulcers, hemorrhoids, and cancer can lead to anemia.
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