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Many pregnant women are diagnosed with anemia. Mild anemia during pregnancy is common, but maybe you’ve just been told that yours is more severe. So, what is anemia, and what causes it? How will you know if you have it? And how is it treated if you do? Let’s explore the ins and outs of anemia during pregnancy.
Table of contents
What is Anemia?
Anemia is often described as a condition where your body doesn’t have enough red blood cells or enough iron. These statements are both true, but indicate different forms of anemia.
Iron-deficiency anemia is the most common form of anemia during pregnancy. Hemoglobin is the protein in red blood cells that carries oxygen to other cells in your body, and iron is needed to make hemoglobin (2). So, iron-deficiency anemia occurs when your body doesn’t have enough iron to produce adequate amounts of hemoglobin (1). This results in less-than-optimal amounts of oxygen traveling to your cells, which can affect both your organs and tissues, as well as the cells of your developing baby.
Folate or B12-deficiency anemia
Folate is a vitamin found in leafy green vegetables, and is also inserted as a supplement in your prenatal vitamin. B12 is a naturally-occurring vitamin found in meat, dairy, and eggs.
Both folate and B12 are necessary to the production of new red blood cells. If mom is not getting enough folate or B12 in her diet, she may not make enough red blood cells to carry oxygen throughout the body.
Why Does Anemia Happen During Pregnancy?
During pregnancy, your blood volume significantly increases to meet the needs of your growing baby (2). In turn, your body needs to make more red blood cells to carry more oxygen. The amount of iron and vitamins that you have stored in your body may not be enough to support the increased need to carry oxygen. If supplementation of iron, folate, or B12 is inadequate, anemia can develop.
How Do I Know if I Have Anemia During Pregnancy?
While certainly not everyone develops anemia during pregnancy, it’s not particularly uncommon either. Your chances of becoming anemic (or entering pregnancy anemic) increase under the following conditions:
- You’ve had babies close together
- Are carrying more than one baby
- Have bleeding during pregnancy or very heavy periods
- Experience frequent vomiting
- Eat a poor diet
- Not supplementing with a prenatal vitamin
Sometimes, though, women experience anemia without any of these factors.
If you become anemic during pregnancy, you may experience any or all of these symptoms: (2, 3, 4)
- Lightheadedness or dizziness
- Shortness of breath
- Pale skin
- Rapid heartbeat or palpitations
- Trouble concentrating
Of course, some of these symptoms occur in pregnancy for other reasons, and alone do not indicate anemia. Feeling them to a higher degree than is typical may suggest that you might be anemic. Communicate your symptoms to your healthcare provider. While screening for anemia is routine at certain stages of the pregnancy, your doctor will be able to determine if additional testing would be beneficial.
Screening for anemia is routinely included in the blood work performed at your first full prenatal appointment. Screening tests are done again at your 28-week appointment (3). If the tests reveal that your hematocrit (proportion of red blood cells in your blood) is lower than 37 and your hemoglobin is under 12, you may be diagnosed with anemia (1).
Treatment for Iron-Deficiency Anemia During Pregnancy
It is recommended that while pregnant, you get at least 27 milligrams of iron a day, from either diet or supplements (5).
The best way to prevent anemia or to treat mild anemia during pregnancy is by eating a diet that contains foods rich in iron. This includes: (3, 4, 5)
- Lean beef and pork
- Leafy greens like spinach
- Liver and other organ meats
- Dried fruits
- Whole grains
Most prenatal vitamins contain iron. However, in some cases, your doctor or midwife may recommend an iron supplement in addition to a healthy diet and prenatal vitamin. If you need to take an iron supplement, here are some things to know:
- Vitamin C can help your body absorb iron, so it may help to take your pill with fruit juice or with a meal high in Vitamin C (3).
- Calcium can block iron absorption, so if you’re also taking a calcium supplement, take it at different times of day than your iron supplement (5).
- Iron supplements can cause constipation, nausea, and bloating (1). Eating plenty of fiber-rich foods and drinking plenty of water will help prevent constipation.
- If these natural measures aren’t enough to combat your constipation, your provider may recommend a gentle stool softener like Colace (7).
Sometimes, particularly if your anemia is severe, your doctor or midwife may recommend iron IV infusions instead of oral supplements. One of the benefits of an IV infusion is that it produces a faster rise in hemoglobin than oral supplements. The other major benefit is that IV iron infusions are less likely produce the challenging gastrointestinal symptoms that many women experience with oral supplements (6). If your provider recommends IV infusions, you may want to take a look at this resource to learn about what to expect.
If you’re anemic when you go into labor, the blood loss associated with delivery can sometimes cause anemia, especially if mom experiences postpartum hemorrhage (4). The risk is greatest in a delivery of multiples, because the uterus is over distended and the size changes rapidly after delivery.
Postpartum anemia is usually treated with supplements, but is serious (though rare) cases a blood transfusion may be necessary (4, 1). If you do experience postpartum anemia, try to line up plenty of help at home with baby care and housework as you may tire very easily. You may also become lightheaded or dizzy when getting up from a lying or sitting position, so move slowly and consider picking up your baby after standing rather than standing while holding him or her.
Ultimately, it’s important to remember than anemia is highly treatable and is rarely a cause for serious concern. It’s important to eat a healthy diet and take supplements as recommended by your healthcare provider. But typically, anemia isn’t something that should cause undue worry. And if you’d like to learn more about anemia during pregnancy, check out this helpful guide from the American Society of Hematology.
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1. Curtis, G. B., & Schuler, J. (2016). Your pregnancy week by week. Cambridge, MA, MA: Da Capo Life Long.
2. Anemia and Pregnancy. (n.d.). Retrieved July 08, 2020, from https://www.hematology.org/education/patients/anemia/pregnancy
3. Barratt, J., Cross, C., Steel, S., & Biswas, C. (2016). The pregnancy encyclopedia: All your questions answered. London: Dorling Kindersley Limited.
4. Simkin, P., Whalley, J., Keppler, A., Durham, J., & Bolding, A. (2018). Pregnancy, childbirth, and the newborn: The complete guide. New York, NY, NY: Da Capo Lifelong.
5. American College of Obstetricians and Gynecologists. (2016). Your Pregnancy and Childbirth: Month to month.
6. Shafi, D., Purandare, S. V., & Sathe, A. V. (2012). Iron deficiency anemia in pregnancy: intravenous versus oral route. Journal of obstetrics and gynaecology of India, 62(3), 317–321. https://doi.org/10.1007/s13224-012-0222-0
7. Mayo Clinic. (2020). Pregnancy week by week: Is it safe to take stool softeners to treat pregnancy constipation?