Blood loss is the most common cause of anemia, especially iron-deficiency anemia. Blood loss can be short term or persist over time.Heavy menstrual periods or bleeding in the digestive or urinary tract can cause blood loss. Surgery, trauma, or cancer also can cause blood loss.If a lot of blood is lost, the body may lose enough red blood cells to cause anemia.
Anemia describes the condition in which the number of red blood cells or Hemoglobin in the blood is low. For this reason, doctors sometimes describe someone with anemia as having a low blood count. A person who has anemia is called anemic.The normal level of hemoglobin is generally different in males and females. For men, a normal hemoglobin level is typically defined as a level of more than 13.5 gram/100 ml, and in women as hemoglobin of more than 12.0 gram/100 ml.