Pneumonia during pregnancy

By trimester

Weeks 1–13

1st trimester

Pneumonia can be harder to spot early on since fatigue and a mild cough can overlap with ordinary first-trimester symptoms. If pneumonia is suspected, a chest x-ray should not be withheld just because you're pregnant. It remains the standard way to confirm it and check how serious it is.

Weeks 14–27

2nd trimester

More advanced gestational age has been identified as its own independent risk factor for pneumonia, so the risk doesn't stay flat across pregnancy. A fever above 38°C paired with shortness of breath is the combination clinicians look for at any stage.

Weeks 28–birth

3rd trimester

Pneumonia late in pregnancy has been linked to a higher chance of delivering before 34 weeks, which is part of why hospitalization is the standard recommendation rather than managing it from home. Getting evaluated promptly if breathing feels harder than usual is worth the trip.

What does the evidence show for pneumonia?

• Cough shows up in more than 90% of pregnant patients with pneumonia, with shortness of breath in about two-thirds and pleuritic chest pain (pain with breathing in) in about half, and the condition affects roughly 1.51 per 1,000 pregnancies, or about 1 in 660 deliveries. 1
• Pregnant patients with pneumonia were significantly more likely to deliver before 34 weeks, and infants born to mothers with antepartum pneumonia have measured significantly lower birthweights than controls, which is why pregnant patients get a higher level of surveillance than the general population. 1
• Hospitalization is the standard recommendation for a pregnant patient with confirmed pneumonia, to allow effective supportive and antimicrobial care and to minimize the risk of preterm labor and delivery. 2
• In a case series of pregnant patients with pneumonia, a fever above 38°C combined with shortness of breath was found in essentially every patient, and the authors stress that chest radiographs should never be withheld from a pregnant woman when pneumonia is suspected. 3
• Guidelines call for a higher blood-oxygen saturation target in pregnancy than for non-pregnant adults, reflecting pregnancy's increased oxygen demands, which is one reason oxygen levels are watched especially closely when a respiratory infection like pneumonia is suspected. 4

When should I call my provider about pneumonia?

A cold or bronchitis that turns into a fever above 38°C combined with shortness of breath, a fast heart rate, pain when you breathe in, or coughing up colored or bloody sputum has crossed into territory that needs same-day evaluation rather than home care. More advanced gestational age is itself a risk factor, so don't wait it out later in pregnancy the way you might have earlier. If you have a home pulse oximeter and your reading trends down, or breathing feels noticeably harder than talking, seek care right away. Noticing less fetal movement alongside respiratory symptoms is its own reason to call immediately. Whatever the pattern, any symptom that feels beyond your usual range is a reason to call: obstetric teams expect these questions and would rather hear early than late.