Shortness of Breath During Pregnancy: Normal or Not?

Why does pregnancy cause shortness of breath?

Several normal physiologic changes conspire to make breathing feel harder during pregnancy:

• Expanding blood volume — the body produces significantly more blood to supply the placenta, which increases the heart's workload and oxygen demands
• Rising progesterone — this hormone acts on the brain's respiratory center and drives a deeper, faster breathing pattern; many people notice this as a sense of breathlessness even in early pregnancy
• Uterine growth — as the uterus enlarges, it pushes the diaphragm upward by several centimeters, reducing the space the lungs can expand into; this is most pronounced in the third trimester
• Anemia — iron-deficiency anemia is common in pregnancy and reduces the blood's oxygen-carrying capacity, worsening the sensation of breathlessness 1Ref 1Leung AKC, Lam JM, Wong AHC, Hon KL, Li X (2024).Iron Deficiency Anemia: An Updated Review.Iron-deficiency anemia as a common cause of breathlessness in pregnancy

The result is that many people feel winded doing things that were previously effortless — walking up stairs, carrying bags, even just lying on their back.

When does breathlessness in pregnancy typically start?

The progesterone effect begins early, often in the first trimester, and accounts for much of the breathlessness women notice before the belly is large enough to push on the diaphragm. As the pregnancy progresses into the second and third trimesters, the mechanical component (uterus pressing upward) becomes more prominent.

For many people, breathlessness paradoxically improves slightly in the final weeks before delivery as the baby "drops" into the pelvis (called lightening), giving the diaphragm a little more room.

How do I know if my breathlessness is pregnancy-related or something else?

Normal pregnancy breathlessness tends to: - Come on gradually over days to weeks - Be mild to moderate in severity - Improve or stay stable with rest and position changes (sitting upright tends to help) - Not be accompanied by chest pain, rapid heart rate, or coughing up blood

Breathlessness that warrants evaluation: - Asthma — if you had asthma before pregnancy, it can change in unpredictability; it may worsen, improve, or stay the same. New wheezing, cough, or episodic chest tightness suggests asthma may need attention 2Ref 2National Asthma Education and Prevention Program (2007).Expert Panel Report 3 (EPR-3): Guidelines for the Diagnosis and Management of Asthma—Summary Report 2007.Importance of asthma management during pregnancy for maternal and fetal outcomes - Anemia — iron deficiency is extremely common; breathlessness with fatigue, pale skin, and rapid heart rate can signal significant anemia that responds well to iron treatment 1Ref 1Leung AKC, Lam JM, Wong AHC, Hon KL, Li X (2024).Iron Deficiency Anemia: An Updated Review.Iron-deficiency anemia as a common cause of breathlessness in pregnancy - Pulmonary embolism — blood clots are more common in pregnancy due to changes in clotting factors; pregnant women have a fourfold to fivefold increased risk of thromboembolism compared with non-pregnant women; sudden breathlessness, particularly with leg pain or chest pain, needs urgent evaluation 3Ref 3American College of Obstetricians and Gynecologists (2018).Thromboembolism in Pregnancy (Practice Bulletin No. 196).Pregnant and postpartum women have a fourfold to fivefold increased risk of venous thromboembolism (including PE) compared with non-pregnant women; PE is a leading cause of maternal mortality in the US - Peripartum cardiomyopathy — a rare but serious condition in which the heart weakens; look for breathlessness when lying flat, swollen legs, and significant fatigue in the third trimester or shortly after delivery

Can I have asthma and pregnancy breathlessness at the same time?

Yes, and distinguishing between the two matters because uncontrolled asthma in pregnancy carries risks for both the pregnant person and the baby. The National Asthma Education and Prevention Program notes that managing asthma during pregnancy is important — poorly controlled asthma can reduce fetal oxygen delivery 2Ref 2National Asthma Education and Prevention Program (2007).Expert Panel Report 3 (EPR-3): Guidelines for the Diagnosis and Management of Asthma—Summary Report 2007.Importance of asthma management during pregnancy for maternal and fetal outcomes.

Asthma-related breathlessness tends to come in episodes, often with wheeze or a tight chest, and may worsen with specific triggers. Pregnancy-related breathlessness is more constant and predictable with position and rest. A Gale clinician can help sort this out and connect you with appropriate asthma care if needed.

What can help with breathlessness during pregnancy?

For normal physiologic breathlessness:

• Posture — sit upright rather than slouching; avoid lying flat in late pregnancy
• Slowing down — break exertion into shorter segments and rest frequently
• Sleep position — lying on your left side takes pressure off the large blood vessels and tends to ease breathing
• Treating anemia — if your iron is low, supplementing as recommended by your clinician can meaningfully improve breathlessness
• Nasal congestion — pregnancy rhinitis (nasal swelling) compounds breathing difficulty; saline rinses are safe

Avoid overexertion, but note that appropriate-intensity exercise during pregnancy is generally beneficial and does not worsen breathlessness in the absence of underlying disease.

When should I contact a clinician about breathlessness in pregnancy?

Contact your clinician or Gale the same day for: - Breathlessness that came on suddenly and is noticeably different from before - Breathlessness accompanied by a fast or pounding heart rate - Chest pain of any kind - Swollen or painful legs alongside breathing difficulty - Breathlessness severe enough to interrupt normal speech - Any new wheezing

Your Gale primary care clinician can evaluate your breathing, check your oxygen level, order basic blood tests, and determine whether a specialist or urgent workup is needed.