Anemia During Pregnancy
The short answer
Anemia during pregnancy is very common, affecting up to 40% of pregnant people worldwide. It is most often caused by iron deficiency due to the increased blood volume and iron demands of pregnancy. Symptoms include extreme fatigue, weakness, pale skin, dizziness, and shortness of breath. It is treatable with iron supplementation and dietary changes.
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By Age
What to expect by age
Your provider will check your hemoglobin at your first prenatal visit. Even if levels are normal initially, anemia can develop later. Take your prenatal vitamin (which contains iron) consistently. Iron-rich foods include lean red meat, spinach, beans, fortified cereals, and lentils. Vitamin C helps iron absorption.
Blood volume expands significantly in the second trimester, naturally diluting red blood cells (physiologic anemia of pregnancy). Your provider will recheck hemoglobin levels, typically around 24-28 weeks. If anemia is detected, additional iron supplementation may be prescribed. Take iron supplements with vitamin C and away from calcium-rich foods for best absorption.
Iron demands are highest in the third trimester as the baby builds iron stores for the first months of life. Severe anemia can increase risks of preterm birth, low birth weight, and postpartum hemorrhage. If oral iron is not sufficient, IV iron infusions are a safe and effective option during pregnancy.
What Should You Do?
When to take action
- Mild anemia detected on routine blood work without significant symptoms
- Fatigue that is typical of pregnancy and responds to rest
- Hemoglobin levels that improve with iron supplementation
- Extreme fatigue beyond normal pregnancy tiredness
- Persistent dizziness, weakness, or shortness of breath with minimal exertion
- Pale skin, lips, or nail beds
- Heart palpitations or racing heart
- Severe dizziness or fainting
- Chest pain or severe shortness of breath
- Signs of severe anemia: extreme weakness, confusion, or rapid heartbeat at rest
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Maternal Concerns
Extreme Tiredness During Pregnancy
Extreme fatigue is one of the most common and earliest symptoms of pregnancy, affecting nearly all pregnant people at some point. It is caused by surging progesterone levels, increased blood production, metabolic changes, and the enormous energy demands of growing a baby. Fatigue is typically most intense in the first and third trimesters.
Craving Non-Food Items During Pregnancy (Pica)
Pica is the craving and sometimes consumption of non-food items during pregnancy, such as ice, dirt, clay, chalk, or laundry starch. It affects an estimated 28% of pregnant people worldwide and may be associated with iron deficiency or other nutritional deficiencies. It should always be discussed with your provider.
Dizziness and Fainting in Pregnancy
Dizziness is common during pregnancy, affecting many pregnant people at various stages. It can be caused by low blood pressure, blood pooling in the legs, low blood sugar, anemia, dehydration, or the growing uterus compressing major blood vessels. While usually benign, fainting should always be reported to your provider.
Dealing with Abnormal Prenatal Screening Results
An abnormal prenatal screening result can be terrifying, but it is important to understand that screening tests are designed to cast a wide net and have significant false-positive rates. Most people with abnormal screening results go on to have healthy babies after further testing confirms the baby is fine. An abnormal screening is a reason for more information, not a diagnosis.
Pregnancy Over 35 (Advanced Maternal Age)
While pregnancy after 35 carries some increased risks (including chromosomal abnormalities, gestational diabetes, and hypertension), the vast majority of people over 35 have healthy pregnancies and healthy babies. The term "geriatric pregnancy" is outdated and does not reflect reality. With appropriate prenatal care and monitoring, outcomes are excellent.
Amniocentesis Questions and Fears
Amniocentesis is a diagnostic test performed between 15-20 weeks that analyzes amniotic fluid to detect chromosomal conditions and genetic disorders with over 99% accuracy. The risk of pregnancy loss from the procedure is approximately 1 in 500-1,000 when performed by an experienced provider. Understanding the actual risks can help you make an informed decision.