Pregnancy congestion is real, it’s common, and it’s caused by the same hormones keeping your pregnancy on track. Somewhere between 9% and 39% of pregnant women experience what’s known as pregnancy rhinitis, a persistent stuffiness that typically shows up after the 20th week of pregnancy and can last until about two weeks after delivery. You’re not imagining it, and you probably don’t have a cold.
How Pregnancy Hormones Cause Congestion
The main culprits are estrogen and progesterone, both of which rise steadily throughout pregnancy and peak in the third trimester. These hormones don’t just support fetal development. They also change the tissue lining your nasal passages in several ways at once.
Estrogen increases blood flow to the nasal lining, causing the tissue to swell and produce more mucus. It also interferes with an enzyme that normally keeps nerve-driven swelling in check, which means your nose essentially loses one of its built-in tools for staying open. Progesterone compounds the problem by relaxing the smooth muscle in nasal blood vessels, allowing them to widen further. The result is a swollen, engorged nasal lining that physically blocks airflow.
On top of that, pregnancy increases your total blood volume by roughly 50%, and the extra fluid can accumulate in soft tissues, including those in and around your nose and throat. This combination of swelling, extra blood flow, and fluid retention is why you can feel completely stuffed up without any infection or allergens involved.
How to Tell It’s Not a Cold or Allergies
Pregnancy rhinitis has a distinct profile. The hallmark symptom is persistent nasal congestion, a blocked or stuffy nose, without the other symptoms you’d expect from an illness. If you don’t have a fever, sore throat, body aches, or thick discolored mucus, it’s unlikely to be a cold or sinus infection. If you’re not sneezing frequently and your eyes aren’t itchy or watery, allergies are less likely.
The timing also helps narrow it down. Pregnancy rhinitis most often develops in the second or third trimester and lasts at least six weeks. A cold resolves in about 7 to 10 days. Allergies tend to follow seasonal patterns or flare around specific triggers. If your congestion appeared well into your pregnancy, has lingered for weeks, and involves mostly a blocked nose, hormonal congestion is the most probable explanation.
Why It Gets Worse at Night
You’ve probably noticed the stuffiness is worst when you lie down. That’s because gravity is no longer helping drain fluid away from your head and nasal passages. Blood pools in the already-swollen tissue, and the congestion intensifies. This can make it hard to fall asleep, disrupt your sleep quality, and leave you exhausted during the day.
Chronic nasal congestion during pregnancy can also contribute to snoring and, in some cases, sleep-disordered breathing. The swollen membranes in the nose and throat narrow the airway, and the extra fluid retention in the neck and surrounding tissues can increase resistance to airflow even further. If you or your partner notice loud snoring, gasping, or pauses in your breathing at night, it’s worth bringing up at your next prenatal visit.
Safe Ways to Relieve Congestion
Since pregnancy rhinitis is driven by hormones, it won’t fully resolve until after delivery. But several approaches can meaningfully reduce your symptoms day to day.
Saline Rinses
Flushing your nasal passages with a saline solution is one of the most effective, safest options available. It physically clears mucus and reduces swelling without any medication. Many people notice improvement after a single use, and studies show that regular saline irrigation can keep symptoms improved for months. You can use a squeeze bottle or neti pot with distilled or previously boiled water. Do it once or twice a day, or whenever congestion peaks.
Elevating Your Head at Night
Propping your head up with an extra pillow or two (or placing a wedge under the head of your mattress) helps gravity work in your favor. This reduces fluid pooling in the nasal tissue and can make a noticeable difference in how easily you breathe while sleeping.
Humidity and Hydration
Dry air thickens mucus and irritates already-swollen nasal tissue. Running a cool-mist humidifier in your bedroom adds moisture to the air and can help keep passages more open. Staying well hydrated during the day also thins mucus, making it easier to clear.
Nasal Strips
Adhesive nasal strips that you place across the bridge of your nose physically hold your nostrils open wider. They’re drug-free and safe during pregnancy. They won’t reduce the underlying swelling, but they can improve airflow enough to help with sleep.
What to Know About Medications
Most over-the-counter decongestants are not straightforward choices during pregnancy. Pseudoephedrine, one of the most common OTC decongestants, has been linked to a small risk of abdominal wall birth defects and should not be used during the first trimester. There is a corticosteroid nasal spray considered safe during pregnancy, but you should check with your prenatal care provider before starting any medication, including ones available without a prescription.
Standard decongestant nasal sprays (the kind you’d normally grab for a cold) carry their own risk: rebound congestion. After a few days of use, they can make stuffiness worse when you stop, creating a cycle that’s especially frustrating when you’re already dealing with hormone-driven swelling.
When Congestion Will End
For most women, pregnancy rhinitis clears up within two weeks of delivery. Once estrogen and progesterone levels drop after birth, the nasal swelling and extra blood flow subside on their own. If your congestion persists well beyond two weeks postpartum, there may be another cause at play, such as allergies or a structural issue, worth following up on with your provider.