Shortness of Breath
Shortness of breath is common in the second and third trimesters as the growing uterus pushes up against the diaphragm, reducing lung capacity. Some breathlessness with exertion is normal.
Common Causes
- Growing uterus presses on the diaphragm, reducing lung expansion
- Progesterone stimulates the respiratory center, increasing breathing rate
- Increased blood volume requires more oxygen circulation
- Anemia — reduced red blood cells carry less oxygen
- Nasal congestion reducing airflow
- Normal exertion becomes more demanding as body weight increases
- In serious cases: pulmonary embolism, preeclampsia, or cardiac issues
Remedies That May Help
Good Posture
Sitting and standing tall maximizes the space available for your lungs to expand.
Sleep Propped Up
Sleeping with extra pillows supporting your upper body can ease nighttime breathlessness.
Slow Down
Listen to your body — rest when needed and slow your pace during physical activity.
Light Exercise
Regular gentle exercise maintains cardiovascular fitness and often improves breathlessness over time.
Treat Nasal Congestion
A saline nasal spray can clear congestion and improve airflow.
Iron for Anemia
If anemia is contributing, iron supplements under provider guidance can improve oxygen-carrying capacity.
When to Call Your Doctor
- Sudden, severe shortness of breath at rest
- Shortness of breath with chest pain or rapid heart rate
- Shortness of breath with coughing up blood
- Blue tinge to the lips or fingertips
- Breathing difficulty that comes on suddenly or worsens rapidly
- Shortness of breath along with leg pain or swelling (possible blood clot)
- Breathlessness at rest that is new or worsening
Frequently Asked Questions
When does shortness of breath start in pregnancy?
It typically becomes noticeable in the second trimester (around weeks 13–27) and is most pronounced in the third trimester when the uterus is largest.
Does the baby drop help breathing?
Yes — 'lightening' (when the baby descends into the pelvis near the end of pregnancy) relieves pressure on the diaphragm and makes breathing easier.
Can shortness of breath hurt my baby?
Normal pregnancy breathlessness does not harm the baby. Your body automatically compensates to ensure the baby receives adequate oxygen.
Is shortness of breath worse with twins?
Yes — multiple pregnancies often cause more pronounced breathlessness because the uterus is larger.
Can I exercise if I'm short of breath during pregnancy?
Mild shortness of breath during exertion is normal. You should be able to hold a conversation while exercising. If you can't, slow down.