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{{#invoke:Hatnote|hatnote}} {{#invoke:Pp-move-indef|main}} {{#invoke:Infobox|infobox}} Anemia, also spelled anaemia or anæmia, is usually defined as a decrease in the amount of red blood cells (RBCs) or hemoglobin in the blood.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> It can also be defined as a lowered ability of the blood to carry oxygen.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> When anemia comes on slowly the symptoms are often vague and may include: feeling tired, weakness, shortness of breath or a poor ability to exercise. Anemia that comes on quickly often has greater symptoms which may include: confusion, feeling like one is going to pass out, and increased thirst. Anemia must be significant before a person becomes noticeably pale. Additional symptoms may occur depending on the underlying cause.<ref name=EBM2013>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref>

There are three main types of anemia: that due to blood loss, that due to decreased red blood cell production, and that due to increased red blood cell breakdown. Causes of blood loss include trauma and gastrointestinal bleeding, among others. Causes of decreased production include iron deficiency, a lack of vitamin B12, thalassemia and a number of neoplasms of the bone marrow among others. Causes of increased breakdown include a number of genetic conditions such as sickle cell anemia, infections like malaria and some autoimmune diseases among others. It can also be classified based on the size of red blood cells and amount of hemoglobin in each cell. If the cells are small it is microcytic anemia, if they are large it is macrocytic anemia and if they are normal sized it is normocytic anemia. Diagnosis in men is based on a hemoglobin of less than 130 to 140 g/L (13 to 14 g/dL), while in women it must be less than 120 to 130 g/L (12 to 13 g/dL).<ref name=EBM2013 /><ref name=Smith2010>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Further testing is then required to determine the cause.<ref name=EBM2013 />

Certain groups of individuals, such as pregnant women, benefit from the use of iron pills for prevention.<ref name=EBM2013 /><ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Dietary supplementation, without determining the specific cause, is not recommended. The use of blood transfusions is typically based on a person's signs and symptoms.<ref name=EBM2013 /> In those without symptoms they are not recommended unless hemoglobin levels are less than 60 to 80 g/L (6 to 8 g/dL).<ref name=EBM2013 /><ref name=Amir2013 /> These recommendations may also apply to some people with acute bleeding.<ref name=EBM2013 /> Erythropoiesis-stimulating medications are only recommended in those with severe anemia.<ref name=Amir2013>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref>

Anemia is the most common disorder of the blood with it affecting about a quarter of people globally.<ref name=EBM2013 /> Iron-deficiency anemia affects nearly 1 billion.<ref name=LancetEpi2012>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> In 2013 anemia due to iron deficiency resulted in about 183,000 deaths – down from 213,000 deaths in 1990.<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> It is more common in females than males,<ref name=LancetEpi2012 /> among children, during pregnancy, and in the elderly.<ref name=EBM2013 /> Anemia increases costs of medical care and lowers a person's productivity through a decreased ability to work.<ref name=Smith2010 /> The name is derived from Ancient Greek: ἀναιμία{{#invoke:Category handler|main}} anaimia{{#invoke:Category handler|main}}, meaning "lack of blood", from ἀν- an-, "not" + αἷμα haima, "blood".<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>


Anemia sections
Intro  Signs and symptoms  Causes  Diagnosis  Treatments  Epidemiology  History  References  External links  

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