Coughing is not a direct symptom of pregnancy in the way that nausea or fatigue are. However, pregnancy causes hormonal and physical changes that can lead to nasal congestion and excess mucus, which in turn can trigger a cough. About 30% of pregnant women develop a condition called pregnancy rhinitis, a persistent stuffy nose caused by hormonal shifts, and the postnasal drip that comes with it is one of the most common indirect causes of coughing during pregnancy.
Why Pregnancy Can Cause a Cough
Rising levels of estrogen and progesterone during pregnancy affect more than the uterus. Estrogen receptors exist in the lining of your nasal passages, and as estrogen climbs through the second and third trimesters, it increases blood flow to the nasal tissue, causes swelling, and ramps up mucus production. Progesterone adds to the problem by dilating blood vessels in the upper airway, which makes the swelling worse.
The result is a chronically stuffy nose with extra mucus draining down the back of your throat. That postnasal drip irritates the throat and can produce a persistent, dry, or tickly cough, especially at night when you’re lying down. This is the most common pathway from pregnancy to coughing: hormones cause congestion, congestion causes drip, and drip causes cough.
Pregnancy Rhinitis: Timing and Duration
Pregnancy rhinitis most commonly appears in the third trimester, though some women notice symptoms earlier. To qualify as pregnancy rhinitis rather than a passing cold, the congestion typically lasts at least six weeks and isn’t linked to allergies or infection. Studies from Saudi Arabia found that roughly 29% to 31% of pregnant women met the criteria for pregnancy rhinitis, suggesting it affects nearly one in three pregnancies.
The good news is that the condition resolves on its own. Most women find their congestion clears within a few days to two weeks after delivery. In the meantime, the cough that comes along with it should improve as the congestion does.
Other Reasons for Coughing During Pregnancy
Not every cough during pregnancy traces back to hormones. Your immune system shifts during pregnancy to protect the developing baby, which can make you slightly more vulnerable to colds and upper respiratory infections. A standard viral cold is by far the most common cause of a sudden cough in pregnancy and follows the same course it would otherwise, usually resolving within one to two weeks.
Acid reflux is another frequent culprit. As the uterus grows, it pushes the stomach upward and relaxes the valve between the stomach and esophagus. Stomach acid can creep into the throat and trigger a cough, particularly after meals or when lying flat. This type of cough tends to come with a sour taste or a burning sensation in the chest.
Asthma can also change during pregnancy. Roughly one third of women with pre-existing asthma find their symptoms worsen, one third improve, and one third stay the same. If you had mild asthma before pregnancy, you may notice more coughing or wheezing than usual.
When a Cough Needs Attention
A mild, dry cough paired with a stuffy nose and no fever is usually nothing to worry about. But certain patterns deserve a closer look. A cough that comes with shortness of breath, a racing heart, or chest pain could signal a blood clot in the lungs (pulmonary embolism), which is more common during pregnancy due to changes in blood clotting. A persistent cough with swelling in the legs, difficulty breathing when lying down, or unusual fatigue could point to cardiac strain.
A cough with thick green or yellow mucus and a fever over 100.4°F suggests an infection that may need treatment. And a cough that lasts more than three weeks without improving, or one that gets dramatically worse, warrants a call to your provider regardless of other symptoms.
Managing a Pregnancy Cough at Home
Since most pregnancy-related coughs stem from congestion and postnasal drip, addressing the congestion is the most effective strategy. Saline nasal rinses flush mucus and irritants from the nasal passages without any medication. Using a humidifier in your bedroom adds moisture to the air and can keep nasal tissue from drying out and swelling further. Sleeping with your head slightly elevated helps reduce the pooling of mucus in the back of your throat.
Gargling with warm salt water soothes an irritated throat and can reduce the urge to cough. Staying well hydrated thins mucus, making it easier to clear. These approaches are safe at any stage of pregnancy and often provide enough relief on their own.
Over-the-Counter Options
If non-medication approaches aren’t enough, a few over-the-counter ingredients have reasonable safety data in pregnancy. Dextromethorphan, the cough suppressant found in many cough syrups, does not appear to increase the risk of birth defects based on available evidence. If you use it, choose a product that does not contain alcohol. Guaifenesin, which thins mucus, is generally considered acceptable in the second and third trimesters, though one study found a possible link to a specific type of hernia when used in the first trimester. Plain cough drops containing benzocaine also have reassuring safety data.
The key principle is to pick single-ingredient products rather than combination cold medicines. Multi-symptom formulas often include ingredients you don’t need, like decongestants that may carry more risk during pregnancy. Read the label and match the active ingredient to your specific symptom.