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Anemia means that red blood cells or the amount of hemoglobin in red blood cells is low. Hemoglobin is a protein that carries oxygen in red blood cells.
There are many types of anemia. Common ones are low amounts of iron, folic acid (a B vitamin), and vitamin B12. In general, symptoms include:
With anemia from low iron, extra symptoms can occur. These include:
In the United States, up to 20% of all women of childbearing age have this form of anemia. Only 2% of adult men do. The main cause is blood lost during menstruation. Eating too few iron-rich foods or not absorbing enough iron can make the problem worse.
Pregnancy, breastfeeding, and blood loss from peptic ulcers or other medical problems, can also deplete iron levels. Older women who have poor diets, especially when they live alone, often have low iron anemia.
When folic acid is very low, extra symptoms can occur. These include:
Folic acid is needed to make red blood cells. Folic acid levels are low from a lack of folic acid in the diet or faulty absorption. The need for this vitamin more than doubles during pregnancy. This is often not met by diets of pregnant women. A supplement of 400 micrograms (0.4 milligrams) of folic acid per day is advised.
Females who are planning a pregnancy, should take folic acid, too. Folic acid is important when a female conceives and during the first months of pregnancy. Low folic acid levels at these times have been linked to low birth weight and major birth defects, such as neural tube defects (spina bifida) in babies. Folic-acid deficiency can also lead to infertility and an increased risk of infection. Low levels of this vitamin are often seen among elderly women, especially those who have poor diets.
When vitamin B12 is low, extra symptoms can occur. These include:
When vitamin B12 is very low, nervous system problems can occur, such as:
One form of vitamin B12 deficiency anemia is pernicious anemia. This is usually caused when the body doesn’t absorb vitamin B12 from food. It can result from a lack of digestive acids and a substance called the intrinsic factor. Both are needed to absorb vitamin B12. Other causes are surgery that removes part or all of the stomach and autoimmune problems that cause cells in the stomach’s lining to shrink. Vitamin B12 is found only in animal foods. It is not in plant foods unless the vitamin is added, such as in some cereals.
Also, alcohol, certain drugs, large amounts of aspirin, and some chronic diseases can cause anemia.
Anemia shares symptoms with many health problems. It needs to be diagnosed by a doctor. Treatment for it depends on the type and what caused it. This includes:
Persons with severe anemia may need one or more blood transfusions.
To Get and Absorb Iron
To Get and Absorb Folic Acid
Tips for Getting Vitamin B12
National Heart, Lung, and Blood Institute
nhlbi.nih.gov
No
Yes
Anemia
Anemia
Do you feel very weak and have any of these problems?