<unk>  is<unk>  caused by a lack of<unk> .<unk>  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 such as feeling tired, weak, short of breath, or having decreased ability to exercise.<unk>  that comes on quickly often has more severe symptoms, including: confusion, feeling like one is going to pass out or increased thirst.<unk>  is typically significant before a person becomes noticeably pale. Children with<unk>  may have problems with growth and development. There may be additional symptoms depending on the underlying cause.<unk>  is caused by blood loss, insufficient dietary intake, or poor absorption of<unk>  from food. Sources of blood loss can include heavy periods, childbirth, uterine fibroids, stomach ulcers, colon cancer, and urinary tract bleeding. Poor absorption of<unk>  from food may occur as a result of an intestinal disorder such as inflammatory bowel disease or celiac disease, or surgery such as a gastric bypass. In the developing world, parasitic worms, malaria, and HIV/AIDS increase the risk of<unk> . Diagnosis is confirmed by blood tests.<unk>  can be prevented by eating a diet containing sufficient amounts of<unk>  or by<unk>  supplementation. Foods high in<unk>  include meat, nuts, spinach, and foods made with<unk> -fortified flour. Treatment may include dietary changes and dealing with underlying causes, for example medical treatment for parasites or surgery for ulcers.<unk>  supplements and vitamin C may be recommended. Severe cases may be treated with blood transfusions or<unk>  injections.<unk>  affected about 1.48 billion people in 2015. A lack of dietary<unk>  is estimated to cause approximately half of all<unk>  cases globally. Women and young children are most commonly affected. In 2015,<unk>  due to<unk><unk>  resulted in about 54,000 deaths – down from 213,000 deaths in 1990.
Iron-deficiency anemia
Lead poisoning
Iatrogenic anemia
Megaloblastic anemia
Hemoglobinemia
Nutritional anemia
Sideroblastic anemia
Myelophthisic anemia