Coughing during pregnancy is common and usually harmless. Hormonal shifts, increased blood volume, and changes to your immune system all make coughs more likely, even if you were rarely bothered by them before. Most pregnancy-related coughs resolve on their own or with simple home remedies, though a persistent or worsening cough deserves attention, especially if you have a history of asthma.
Why Pregnancy Makes You More Prone to Coughing
Your body undergoes significant immune system changes during pregnancy. To protect the developing baby, your immune response shifts in a way that allows the pregnancy to progress but also reduces your ability to fight off certain infections. Specifically, the balance between different types of immune cells changes, weakening your defense against viruses. This is why pregnant people tend to catch colds and respiratory infections more easily and may take longer to shake them.
On top of that, rising estrogen and progesterone levels affect more than your reproductive system. Estrogen increases blood flow to the mucous membranes in your nose and throat, causing them to swell. It also ramps up mucus production by stimulating glands in the nasal passages. Progesterone further contributes by relaxing blood vessel walls, which adds to the swelling. The result is a stuffy, drippy nose that sends mucus down the back of your throat, triggering a cough even when you’re not sick.
Pregnancy Rhinitis and Post-Nasal Drip
Between 9% and 39% of pregnant people develop a condition called pregnancy rhinitis, a persistent nasal congestion caused entirely by hormonal changes rather than infection or allergies. Most cases appear after the 20th week of pregnancy, though a Polish study found that 39% of women between weeks 13 and 21 already had symptoms. The congestion tends to worsen as pregnancy progresses because hormone levels keep climbing.
What makes pregnancy rhinitis frustrating is that it looks and feels like a cold that never ends. Your nasal tissues thicken, the tiny blood vessels inside your nose dilate, and excess mucus drips down your throat. That post-nasal drip is one of the most common causes of a lingering cough during pregnancy. Unlike a cold, though, pregnancy rhinitis doesn’t come with a fever, body aches, or colored mucus. It typically resolves within two weeks of delivery.
Colds, Flu, and Other Infections
Because your immune defenses are naturally lowered, you’re more vulnerable to the respiratory viruses that circulate every season. A standard cold during pregnancy follows the same pattern as it would otherwise: sore throat, runny nose, coughing, and mild fatigue that peaks around days three to five and clears within one to two weeks. The cough itself can linger a bit longer, sometimes up to three weeks, as irritated airways heal.
Influenza carries higher stakes during pregnancy. The combination of immune suppression and physical changes to your lungs (your expanding uterus pushes the diaphragm upward, reducing lung capacity) means flu complications are more likely. If your cough comes with a high fever, severe body aches, or difficulty breathing, those symptoms warrant prompt medical evaluation rather than a wait-and-see approach.
When Coughing Signals Something More Serious
For people with pre-existing asthma, pregnancy can go either way. Roughly one-third of asthma patients see symptoms improve, one-third stay the same, and one-third get worse. The concern isn’t the cough itself but what it represents: poorly controlled asthma reduces oxygen delivery to the baby. Uncontrolled asthma during pregnancy has been linked to a higher incidence of low birth weight, preterm birth, preeclampsia, and pregnancy-induced hypertension. If you notice increased wheezing, chest tightness, or nighttime coughing, your asthma management plan likely needs adjusting.
Whooping cough (pertussis) is another condition to be aware of. It starts like an ordinary cold but progresses to severe, uncontrollable coughing fits that can last for weeks. The CDC recommends getting the Tdap vaccine during the 27th through 36th week of each pregnancy, preferably in the earlier part of that window. The vaccine protects both you and your newborn, since babies can’t receive their own pertussis vaccine until they’re two months old.
Safe Ways to Relieve a Cough
Simple, non-medication approaches work well for mild coughs and carry no risk:
- Honey in warm tea coats the throat and has mild cough-suppressing properties. One to two teaspoons in a warm (not scalding) drink can bring noticeable relief.
- Warm saltwater gargling soothes an irritated throat and helps clear mucus. A half teaspoon of salt in eight ounces of warm water is a standard ratio.
- A humidifier adds moisture to dry indoor air, which reduces throat irritation and loosens congestion. Saline nasal sprays work similarly for stuffiness.
- Staying hydrated thins mucus and keeps your throat from drying out. Water, broth, and warm drinks all count.
- Elevating your head at night with an extra pillow can reduce post-nasal drip while you sleep, cutting down on nighttime coughing.
Over-the-Counter Medications
When home remedies aren’t enough, certain over-the-counter options have a reassuring safety profile. Dextromethorphan, the cough suppressant found in many cold products (often labeled “DM”), has been studied in hundreds of pregnancies, including a large project that followed 580 mother-child pairs. None of these studies found an increased risk of birth defects. Guaifenesin, the expectorant that loosens mucus, has a similarly reassuring track record across multiple studies involving hundreds of pregnant participants.
The key is short-term, targeted use. Read labels carefully, because many combination cold products bundle ingredients you may not need, such as decongestants or pain relievers that have different safety considerations during pregnancy. Choose a product that addresses only your specific symptom. Herbal supplements marketed for colds are a different story entirely, as many have not been tested in pregnancy and some may not be safe.
Coughing and Your Baby
A common worry is whether the physical force of coughing can hurt the baby. It won’t. Your baby is cushioned by amniotic fluid inside a muscular uterus, providing excellent shock absorption. Even forceful coughing doesn’t generate enough pressure to cause harm. Some people notice that strong coughing triggers a brief sensation of pelvic pressure or a small urine leak, both of which reflect the strain on your pelvic floor muscles rather than any effect on the baby.
The indirect concern with prolonged, severe coughing is that it can disrupt sleep, reduce appetite, and in the case of uncontrolled asthma or serious infection, affect oxygen levels. That’s why managing the underlying cause matters more than the cough itself. A garden-variety cold that makes you cough for a week or two poses no threat to fetal development.