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Anemia
URL of this page: https://medlineplus.gov/anemia.html

Anemia

Also called: Iron poor blood
On this page

Basics

  • Summary
  • Start Here
  • Symptoms
  • Diagnosis and Tests
  • Prevention and Risk Factors
  • Treatments and Therapies

Learn More

  • Related Issues
  • Specifics
  • Genetics

See, Play and Learn

  • No links available

Research

  • Statistics and Research
  • Clinical Trials
  • Journal Articles

Resources

  • Find an Expert

For You

  • Children
  • Teenagers
  • Women
  • Older Adults
  • Patient Handouts

Summary

If you have anemia, your blood does not carry enough oxygen to the rest of your body. The most common cause of anemia is not having enough iron. Your body needs iron to make hemoglobin. Hemoglobin is an iron-rich protein that gives the red color to blood. It carries oxygen from the lungs to the rest of the body.

Anemia has three main causes: blood loss, lack of red blood cell production, and high rates of red blood cell destruction.

Conditions that may lead to anemia include:

  • Heavy periods
  • Pregnancy
  • Ulcers
  • Colon polyps or colon cancer
  • Inherited disorders
  • A diet that does not have enough iron, folic acid or vitamin B12
  • Blood disorders such as sickle cell anemia and thalassemia, or cancer
  • Aplastic anemia, a condition that can be inherited or acquired
  • G6PD deficiency, a metabolic disorder

Anemia can make you feel tired, cold, dizzy, and irritable. You may be short of breath or have a headache.

Your doctor will diagnose anemia with a physical exam and blood tests. Treatment depends on the kind of anemia you have.

NIH: National Heart, Lung, and Blood Institute

Start Here

  • Anemia (American Academy of Family Physicians) Also in Spanish
  • What Is Anemia? From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Your Guide to Anemia From the National Institutes of Health (National Heart, Lung, and Blood Institute) - PDF

Symptoms

  • Anemia Symptoms From the National Institutes of Health (National Heart, Lung, and Blood Institute)

Diagnosis and Tests

  • Anemia Diagnosis From the National Institutes of Health (National Heart, Lung, and Blood Institute)
  • Blood Smear From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Blood Tests From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Bone Marrow Test From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Complete Blood Count (CBC) From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Ferritin Blood Test From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Haptoglobin (HP) Test From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Hemoglobin Electrophoresis From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Iron Tests From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Lactate Dehydrogenase (LDH) Isoenzymes Test From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Lactate Dehydrogenase (LDH) Test From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Red Blood Cell (RBC) Indices From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Reticulocyte Count From the National Institutes of Health (National Library of Medicine) Also in Spanish
  • Vitamin B Test From the National Institutes of Health (National Library of Medicine) Also in Spanish

Prevention and Risk Factors

  • Anemia Causes and Risk Factors From the National Institutes of Health (National Heart, Lung, and Blood Institute)

Treatments and Therapies

  • Anemia Treatment and Management From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Iron From the National Institutes of Health (National Institutes of Health, Office of Dietary Supplements) Also in Spanish
  • Treatments for Blood Disorders From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Vitamin B12 From the National Institutes of Health (National Institutes of Health, Office of Dietary Supplements) Also in Spanish

Related Issues

  • Anemia in Chronic Kidney Disease From the National Institutes of Health (National Institute of Diabetes and Digestive and Kidney Diseases) Also in Spanish
  • Craving and Chewing Ice: A Sign of Anemia? (Mayo Foundation for Medical Education and Research) Also in Spanish
  • Managing Anemia When You Have Cancer (American Cancer Society) Also in Spanish

Specifics

  • Anemia Due to Excessive Bleeding (Merck & Co., Inc.) Also in Spanish
  • Anemia of Inflammation or Chronic Disease From the National Institutes of Health (National Institute of Diabetes and Digestive and Kidney Diseases) Also in Spanish
  • Hemoglobin C, S-C, and E Diseases (Merck & Co., Inc.) Also in Spanish
  • Hemolytic Anemia From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Iron-Deficiency Anemia From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Paroxysmal Nocturnal Hemoglobinuria (PNH) (Aplastic Anemia and MDS International Foundation)
  • Vitamin B12-Deficiency Anemia From the National Institutes of Health (National Heart, Lung, and Blood Institute) Also in Spanish
  • Vitamin Deficiency Anemia (Mayo Foundation for Medical Education and Research) Also in Spanish

Genetics

  • Congenital dyserythropoietic anemia: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Diamond-Blackfan anemia: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Ghosal hematodiaphyseal dysplasia: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Glucose phosphate isomerase deficiency: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Hereditary folate malabsorption: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Hereditary spherocytosis: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Hypochromic microcytic anemia with iron overload: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Imerslund-Gräsbeck syndrome: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Iron-refractory iron deficiency anemia: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Majeed syndrome: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Mucolipidosis type IV: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Paroxysmal nocturnal hemoglobinuria: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Phosphoglycerate kinase deficiency: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Pyruvate kinase deficiency: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • Thiamine-responsive megaloblastic anemia syndrome: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • TRNT1 deficiency: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)
  • X-linked sideroblastic anemia: MedlinePlus Genetics From the National Institutes of Health (National Library of Medicine)

Statistics and Research

  • Anemia Prevalence: United States, August 2021-August 2023 (Centers for Disease Control and Prevention)
  • FastStats: Anemia or Iron Deficiency (National Center for Health Statistics)

Clinical Trials

  • ClinicalTrials.gov: Anemia, Iron-Deficiency From the National Institutes of Health (National Institutes of Health)

Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

  • Article: Long-term safety and effectiveness of roxadustat in Chinese patients with chronic...
  • Article: Longitudinal Associations Between Maternal Anemia and Breastfeeding Practices on Infant Hemoglobin...
  • Article: Long-Term Transfusion Independence with Luspatercept Versus Epoetin Alfa in Erythropoiesis-Stimulating Agent-Naive,...
  • Anemia -- see more articles

Find an Expert

  • National Heart, Lung, and Blood Institute From the National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases From the National Institutes of Health

Children

  • Anemia (Nemours Foundation)
  • Anemia in the Newborn (Merck & Co., Inc.) Also in Spanish
  • Diamond-Blackfan Anemia (For Parents) (Nemours Foundation) Also in Spanish
  • Hereditary Spherocytosis (Nemours Foundation) Also in Spanish
  • Iron-Deficiency Anemia (Nemours Foundation) Also in Spanish
  • Pyruvate Kinase Deficiency (For Parents) (Nemours Foundation) Also in Spanish
  • What's Anemia? (For Kids) (Nemours Foundation) Also in Spanish

Teenagers

  • Anemia (For Teens) (Nemours Foundation) Also in Spanish

Women

  • Anemia and Pregnancy (American Society of Hematology)
  • Iron-Deficiency Anemia (Department of Health and Human Services, Office on Women's Health) Also in Spanish

Older Adults

  • Anemia (AGS Health in Aging Foundation)

Patient Handouts

  • Anemia (Medical Encyclopedia) Also in Spanish
  • Anemia caused by low iron - infants and toddlers (Medical Encyclopedia) Also in Spanish
  • Anemia of chronic disease (Medical Encyclopedia) Also in Spanish
  • Febrile (warm) and cold agglutinins (Medical Encyclopedia) Also in Spanish
  • Ferritin blood test (Medical Encyclopedia) Also in Spanish
  • Hemolytic anemia (Medical Encyclopedia) Also in Spanish
  • Iron deficiency anemia (Medical Encyclopedia) Also in Spanish
  • Pernicious anemia (Medical Encyclopedia) Also in Spanish
  • Vitamin B12 deficiency anemia (Medical Encyclopedia) Also in Spanish
  • Vitamin B12 level (Medical Encyclopedia) Also in Spanish

Topic Image

Anemia

MEDICAL ENCYCLOPEDIA

  • Aase syndrome
  • Anemia
  • Anemia caused by low iron - children
  • Anemia caused by low iron - infants and toddlers
  • Anemia of chronic disease
  • Antiparietal cell antibody test
  • Bone marrow biopsy
  • Donath-Landsteiner test
  • Drug-induced immune hemolytic anemia
  • Erythropoietin test
  • Febrile (warm) and cold agglutinins
  • Ferritin blood test
  • Folate-deficiency anemia
  • Haptoglobin blood test
  • Hemoglobin C disease
  • Hemoglobin electrophoresis
  • Hemolytic anemia
  • Hemolytic anemia caused by chemicals and toxins
  • Hemolytic crisis
  • Hereditary spherocytic anemia
  • Immune hemolytic anemia
  • Iron deficiency anemia
  • Lactate dehydrogenase test
  • LDH isoenzyme blood test
  • Paroxysmal cold hemoglobinuria (PCH)
  • Paroxysmal nocturnal hemoglobinuria (PNH)
  • Pernicious anemia
  • Plummer-Vinson syndrome
  • Pyruvate kinase blood test
  • Pyruvate kinase deficiency
  • Schilling test
  • Serum free hemoglobin test
  • Serum iron test
  • Stool guaiac test
  • Subacute combined degeneration
  • Sugar-water hemolysis test
  • Total iron binding capacity
  • Vitamin B12 deficiency anemia
  • Vitamin B12 level

Related Health Topics

  • Aplastic Anemia
  • B Vitamins
  • Folic Acid
  • G6PD Deficiency
  • Iron
  • Sickle Cell Disease
  • Thalassemia

National Institutes of Health

The primary NIH organization for research on Anemia is the National Heart, Lung, and Blood Institute

Other Languages

Find health information in languages other than English on Anemia

Disclaimers

MedlinePlus links to health information from the National Institutes of Health and other federal government agencies. MedlinePlus also links to health information from non-government Web sites. See our disclaimer about external links and our quality guidelines.

The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health.

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