Why Am I So Tired During Pregnancy?
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Medically reviewed by
Baby Circle Medical Board
Reviewed on 18 July 2026
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Progesterone and the work of building a placenta drain energyEvidence-based & doctor-reviewed
Fatigue is very common, especially in the first and third trimesters. Rising progesterone, the energy your body spends building the placenta, lower blood sugar and blood pressure, and disrupted sleep all play a part.
Why it happens
Early on, progesterone surges and your body works hard to build the placenta. Iron-deficiency anaemia can make tiredness worse. Later, a big bump and poor sleep add to it.
How to boost energy
- Rest and nap when you can.
- Eat iron- and protein-rich foods and stay hydrated.
- Do gentle activity like walking.
- Keep a calming sleep routine.
When to see a doctor
Mention it if fatigue is extreme or comes with breathlessness, palpitations or pallor — your doctor may check for anaemia or thyroid issues.
Frequently asked questions
When is fatigue worst?
Usually in the first trimester and again in the third; energy often improves in the second.
Could tiredness mean anaemia?
Yes — anaemia is common in pregnancy and worsens fatigue. A simple blood test checks for it.
Is napping okay?
Absolutely — short naps and extra rest are helpful and normal in pregnancy.
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Join The Circle40-Week GuideReferences
- WHO. Antenatal care recommendations. who.int
- ACOG. Pregnancy resources. acog.org
- NHS. Pregnancy guide. nhs.uk
- CDC. During Pregnancy. cdc.gov
- Office on Women's Health (US). womenshealth.gov
Related reading
Why Cannot I Sleep in Pregnancy?Top 25 Iron-Rich Foods for PregnancyWhy Am I Nauseous?📖 40-Week Pregnancy Guide
Medical disclaimer: This article is for general education only and is not a substitute for professional medical advice. Always consult your doctor about your pregnancy and health, and seek care immediately for any warning signs. Reviewed by the Baby Circle Medical Board.