Iron-deficiency anemia is anemia caused by a lack of iron.

Iron-deficiency anemia is usually caused by blood loss, insufficient dietary intake, or poor absorption of iron from food. Sources of blood loss can include heavy periods, childbirth, uterine fibroids, stomach ulcers, colon cancer, and urinary tract bleeding. A poor ability to absorb iron may occur as a result of Crohn's disease or a gastric bypass.

In the developing world, parasitic worms, malaria, and HIV/AIDS increase the risk. Diagnosis is generally confirmed by blood tests.

Iron-deficiency anemia is anemia caused by a lack of iron. Anemia is defined as a decrease in the number of red blood cells or the amount of hemoglobin in the blood. When onset is slow, symptoms are often vague, including feeling tired, weakness, shortness of breath, or poor ability to exercise.

Anemia that comes on quickly often has greater symptoms, including: confusion, feeling like one is going to pass out, and increased thirst. There needs to be significant anemia before a person becomes noticeably pale. Problems with growth and development may occur in children. There may be additional symptoms depending on the underlying cause.

Iron-deficiency anemia affected about 1.48 billion people in 2015. A lack of dietary iron is estimated to cause approximately half of all anemia cases globally. Women and young children are most commonly affected. In 2015 anemia due to iron deficiency resulted in about 54,000 deaths – down from 213,000 deaths in 1990.

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