Iron-deficiency anemia is anemia caused by a lack of iron. [3] Anemia is defined as a decrease in the number of red blood cells or the amount of hemoglobin in the blood. [3] When onset is slow, symptoms are often vague such as feeling tired, weak, short of breath, or having decreased ability to exercise. [1] Anemia that comes on quickly often has more severe symptoms, including confusion D50, an intravenous sugar solution of 50% dextrose D50, the ICD-10 code for iron deficiency anemia D50, the mass-median-diameter in particle-size distribution measurements, considered to be the average particle size by mass D50 (film), working title for a Tamil-language film Before anemia occurs, the medical condition of iron deficiency without anemia is called latent iron deficiency (LID). Anemia is a condition characterized by inadequate red blood cells (erythrocytes) or hemoglobin. When the body lacks sufficient amounts of iron, the production of the protein hemoglobin is reduced. An anemia is a decrease in number of red blood cells (RBCs) or less than the normal quantity of hemoglobin in the blood. [2][3] However, it can include decreased oxygen-binding ability of each hemoglobin molecule due to deformity or lack in numerical development as in some other types of hemoglobin deficiency. [citation needed] Anemia is the most common disorder of the blood. There are several Anemia is the most common blood disorder, affecting about a fifth to a third of the global population. [1][12][13] Iron-deficiency anemia is the most common cause of anemia worldwide, and affects nearly one billion people. [14] This is a shortened version of the fourth chapter of the ICD-9: Diseases of the Blood and Blood-forming Organs. It covers ICD codes 280 to 289. The full chapter can be found on pages 167 to 175 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1. Both volumes can be downloaded for free from the website of the World Health Organization.

Anemia of chronic disease is usually mild but can be severe. It is usually normocytic, but can be microcytic. [6] The presence of both anemia of chronic disease and dietary iron deficiency results in a more severe anemia. Anemia of chronic disease [3] Rare hereditary causes of microcytic anemia include sideroblastic anemia and other X-linked anemias, hereditary hypotransferrinemia, hereditary aceruloplasminemia, erythropoietic protoporphyria, iron-refractory iron deficiency anemia, and other thalassemic mutations (such as hemoglobin E and hemoglobin Lepore