Why did I start snoring all of a sudden?

If you've started snoring out of nowhere, something has usually changed in how air moves through your nose and throat at night. The common triggers are a blocked nose from a cold, allergies or a sinus infection, alcohol or sleeping pills, weight gain, sleeping on your back, lack of sleep and hormone changes. New snoring with gasping, pauses in breathing or daytime sleepiness needs a doctor.

Why do people start snoring?

Snoring happens when your airway is partly blocked during sleep. Cleveland Clinic explains that as air squeezes past, the tissues in your nose, mouth and throat vibrate. The blockage can come from your anatomy, from a temporary condition that causes swelling, like a cold, or from mouth and throat muscles that relax so much they narrow the airway.

A Cleveland Clinic sleep specialist puts it simply: snoring is the sound your airway makes when it's unstable. Anything that makes it floppier or narrower than before can tip a quiet sleeper into snoring. Our guide to reasons you snore covers the long-term causes. Here are the ones that tend to change quickly.

Could a blocked nose be the cause?

A blocked nose is one of the most common reasons for sudden snoring. Cleveland Clinic says nasal congestion from allergies and colds can block airflow. When your nose is partly blocked, you have to work harder to pull air through it, which can draw the soft tissue in your throat together and cause snoring.

Snoring can also be occasional for this reason. Cleveland Clinic notes it can happen during spring allergy season or with a sinus infection. The NHS lists snoring among the symptoms of sinusitis, along with a blocked or runny nose and pain around the cheeks, eyes or forehead. It says sinusitis usually clears up on its own within four weeks.

If your snoring started with a cold or with allergy season, it will often fade as your nose clears. Our guide on why your nose is stuffy at night has more on night-time congestion.

Why am I suddenly breathing through my mouth at night?

Sudden mouth breathing at night usually has the same root cause as new snoring, a blocked nose. Cleveland Clinic says most people breathe through their mouth because they can't get air in through their nose. It lists congestion from colds and allergies, swollen turbinates, nasal polyps and a deviated septum, and sleep apnea can also be involved.

The clues are often in the morning. Cleveland Clinic lists bad breath, drooling, a dry mouth, hoarseness, feeling tired and snoring as common signs, and says a dry mouth, bad breath and drool on your pillow may be the first ones you notice. Signs you mouth breathe at night goes through them.

Cleveland Clinic also says that a nose injury, such as a deviated septum, or nasal polyps can block the nose enough to cause snoring. If one side of your nose has felt blocked since a knock to the face, or the blockage won't clear, get it checked.

Have you been drinking more or taking sleeping pills?

Drinking more or taking sleeping pills can bring on snoring, and alcohol is a classic trigger. Cleveland Clinic says alcohol, sedatives and even lack of sleep can relax the muscles in your upper airway once you fall asleep, limiting airflow. Its sleep specialist calls alcohol at night a central nervous system depressant that "can make your airway more floppy."

Medicines that help you sleep can do the same. The NHS says sleeping pills can sometimes cause snoring, and Cleveland Clinic warns that too much melatonin or other sleep medication can leave your nose and throat muscles too relaxed. If you've recently started taking something to help you sleep, that's worth mentioning to your doctor.

Have you gained weight?

Both the NHS and Cleveland Clinic say you're more likely to snore if you're overweight. Cleveland Clinic says snoring and sleep-related breathing disorders are more common in people with overweight or obesity. Losing weight, if you need to, is on the NHS's list of things to try.

Have you changed how you sleep?

Back sleepers are more likely to snore than side sleepers, according to Cleveland Clinic. Lying on your back can let your tongue relax toward the back of your throat. The NHS suggests a tennis ball sewn into the back of your sleepwear, or a special pillow or wedge, to keep you on your side. Our guide to sleep position and snoring has more ideas.

Could hormones or age be involved?

Hormones and age can both be involved, and hormones can bring on snoring at particular points in life. Cleveland Clinic says hormone changes during pregnancy can contribute to snoring. The NHLBI says women's risk of sleep apnea rises during pregnancy and during and after menopause, partly because of hormone changes, and that women may gain weight, including around the neck, during menopause. Our guides to snoring during pregnancy and menopause and snoring cover each one.

Age plays a slower part. Cleveland Clinic says snoring becomes more common as muscle tone decreases, which narrows the airway. That change is gradual, but you may only notice it when a partner mentions it. The NHS also says you're more likely to snore if you smoke.

What can you try for new snoring?

For new snoring, start with the trigger. The NHS matches treatment to the cause: nasal dilators or strips, or decongestants and nasal sprays, when the nose is blocked or narrow, and a chin strap or a device that makes you breathe through your nose when your mouth falls open. Cleveland Clinic says people with chronic congestion may breathe more easily with antihistamines or steroid nasal sprays.

Nasal strips are a simple place to start if your nose feels tight at night. In a small randomized trial of people with chronic rhinitis, a nasal strip lowered how often they snored compared with a placebo strip, though it didn't change how loud the snoring was.

If your mouth has started falling open but your nose is clear, mouth tape is an option some adults use. A 2025 systematic review found three studies that measured snoring after the mouth was kept closed, and all three reported a significant drop. The reviewers rated the studies as poor quality and flagged a serious risk for anyone taping with a blocked nose, so tape is only for people who breathe comfortably through their nose and have no signs of sleep apnea. How to start mouth taping walks through the first nights.

If you want to try nasal strips and mouth tape together, our pick is the Titan Sleep System, which pairs TitanAir Nasal Strips with Titan Mouth Tape. Titan says every batch is third-party tested and certified PFAS-free.

When is sudden snoring a reason to see a doctor?

See a GP if your new snoring comes with any of the signs of sleep apnoea the NHS lists: breathing that stops and starts while you sleep, gasping, snorting or choking noises, or feeling very tired during the day. The NHS also suggests going if lifestyle changes aren't helping or your snoring has a big impact on you or your partner. Cleveland Clinic adds headaches to the list of reasons to get checked.

Cleveland Clinic says snoring is, in many cases, one of the first signs of obstructive sleep apnea, and that many people with it don't know they stop breathing in their sleep. A partner's report is useful, so bring them along if you can. Nasal strips and mouth tape don't treat sleep apnea.

Read next

• Reasons you snore
• Why do I breathe through my mouth at night?
• Is snoring bad for you?

* This content is for informational and educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease or health condition. Talk to a qualified healthcare provider about your health.