Anemia means that there are too few red blood cells in the blood or that too few red blood cells contain hemoglobin. [B] Hemoglobin [B] (Hb) is an iron-containing protein in red blood cells (erythrocytes) are present and ensure that oxygen from the lungs can be bound and transported.
In one man, the number of red blood cells per mm3 blood approximately 5,200,000, 4,700,000 women.
A red cell has an average lifespan of 90 to 120 days. Old blood through the liver and the spleen removed. There are constantly new red blood cells created in the bone marrow. This process is called erythropoiesis and is governed by the secretion of the hormone erythropoietin (EPO) through the kidneys.
In the beginning, and symptoms of anemia usually so low that they often go unnoticed. They take but in severity as the anemia worsens. Initially you will if you have anemia tired faster and paler than usual. Pallor is most clearly visible in the nail bed, inside of the eyelids and lips and the palms. In anemia, the creases in the palms often as pale as the skin around it. With effort you more breathless than usual. Also you may notice that your heart beats faster than normal.
The most common cause of anemia is iron deficiency. In iron deficiency, the body can not make enough hemoglobin. With a shortage of vitamin B12 (such as pernicious anemia) or folate (folic acid deficiency), the body can not make enough red blood cells. In inherited disorders such as sickle cell anemia, thalassemia or a rare disease of the hemoglobin, the body produces an abnormal form of hemoglobin.