Snoring During Pregnancy: When It Is Normal and When to Tell Your Midwife
More than a third of pregnant women snore, and most of it is ordinary physiology. But snoring that starts during pregnancy is a recognised flag for high blood pressure, and it is worth reporting.
Snoring in pregnancy is common, largely mechanical, and mostly unremarkable. There is one important exception, and it is the reason this article leads with the medical point rather than the remedies.
If you did not snore before pregnancy and you do now, mention it at your next appointment. Not urgently, not with alarm, but do mention it.
Why that matters
A prospective cohort study of 1,719 pregnant women, published in the American Journal of Obstetrics and Gynecology, found that around a third reported snoring and a quarter reported snoring that began during the pregnancy. After adjusting for confounders, pregnancy-onset snoring was independently associated with gestational hypertension and with preeclampsia. Chronic snoring — snoring that predated the pregnancy — was not.
That distinction is the whole point. It is not snoring as such that carries the signal. It is snoring that is new.
The proposed mechanism is straightforward: snoring sits on a continuum with sleep-disordered breathing, and fragmented sleep with intermittent drops in oxygen drives stress hormones, inflammation and blood pressure. The association is not proof that snoring causes anything, and at least one other study found no significant link with preeclampsia, so this remains an active research question rather than settled fact.
What it does mean is that new-onset snoring is cheap and useful information for the people managing your pregnancy. Report it. Let them decide whether it matters.
Report it the same day, rather than at the next appointment, if it comes with any of: headaches that are new or severe, vision changes, swelling in the face or hands, pain below the ribs, or if anyone has witnessed you stop breathing or gasp awake.
Why pregnancy makes you snore
Assuming your midwife or doctor is satisfied there is nothing more going on, the mechanisms are worth knowing, because they point at which remedies can actually help.
Nasal congestion. Rising oestrogen increases blood flow to the mucous membranes and causes them to swell. Pregnancy rhinitis — a persistently blocked, stuffy nose with no infection and no allergy behind it — affects a substantial minority of pregnancies and often arrives in the second trimester. It is the single biggest contributor.
Blood volume. Circulating volume rises by something like 40 to 50% over the pregnancy. More fluid in the tissues means more swelling everywhere, including the airway.
Weight and diaphragm position. Later on, the growing uterus pushes the diaphragm upward, reducing lung volume, while additional weight around the neck and chest narrows the airway. This is why snoring so often begins or worsens in the third trimester.
Sleeping position. Back sleeping worsens snoring by letting the tongue fall backward — and side sleeping is generally recommended in later pregnancy for unrelated circulatory reasons anyway.
What is appropriate to try
The constraint here is that most snoring remedies have never been studied in pregnancy, and "probably fine" is a lower standard than you should accept when pregnant. Clear anything, including anything below, with your midwife or doctor first. That is not a formality on this page.
Side sleeping, supported. The intervention with the best risk profile and one you are likely being advised toward regardless. A pregnancy pillow or a wedge behind the back to prevent rolling over. More on positional snoring.
Nasal strips. Mechanically appropriate for the congestion mechanism, drug-free, and acting entirely outside the body — which is why they are frequently the first thing suggested for pregnancy rhinitis. They open the nasal valve; they do nothing for swelling further inside the nose. Do the cheek-pull test to see whether they can help you: pull the cheek outward beside one nostril and breathe in. If it eases, a strip can reach your narrowing. How to apply one properly.
Saline rinses and humidified air. Drug-free, widely used in pregnancy, and directly aimed at the actual mechanism. Often more effective than anything else here for pregnancy rhinitis.
Head of bed elevated. Blocks under the bed head, or a wedge. Helps both snoring and reflux, which frequently arrive together in the third trimester.
Decongestant sprays and tablets: ask first. Many are not recommended in pregnancy, and rebound congestion makes medicated sprays a poor idea for a condition lasting months.
Mouth taping: not while pregnant, in our view. Nasal congestion is extremely common in pregnancy, and sealing the mouth when the nose is unreliable is exactly the scenario where taping carries genuine risk. The side-effects article explains why. This is one where the honest answer is no.
Sleep apnea in pregnancy
Obstructive sleep apnea is more common in pregnancy than outside it, more common again with higher BMI, and is associated with gestational diabetes and hypertensive disorders. It is also treatable, safely, during pregnancy.
Ask to be assessed if you have loud snoring plus any of: witnessed breathing pauses, gasping or choking awake, morning headaches, or daytime sleepiness beyond ordinary pregnancy fatigue — which is admittedly a hard line to draw, and another reason to let a clinician judge it rather than yourself. What the difference looks like.
And afterwards
For most people, pregnancy snoring resolves within weeks of delivery as blood volume normalises and the congestion settles. If it does not, it is worth investigating properly rather than assuming it is a permanent souvenir.