Snoring is usually treated as a noise problem, something for the person in the next pillow to put up with. But researchers have spent decades asking whether what happens in the airway at night has knock on effects for blood pressure, heart rhythm and the arteries.
The short answer is that the clearest evidence concerns obstructive sleep apnoea, where breathing repeatedly stops and starts, rather than snoring on its own. Snoring without apnoea has weaker and more debated links, though one finding about the neck arteries stands out.
Here is what the main studies found, what they cannot tell you, and what is worth doing if you snore.
Snoring and Sleep Apnoea Are Different Questions
Most of the cardiovascular research measures sleep apnoea, not snoring. The two overlap, but they are not the same thing. Simple snoring is vibration in an airway that stays open. Apnoea involves repeated partial or complete blockages, and how often they happen per hour of sleep is what a sleep study measures.
That matters when reading headlines. A study showing that people with apnoea have more high blood pressure does not mean that every snorer is at the same risk. If you are not sure which group you are in, the signs and the NHS testing route are covered in is snoring a sign of sleep apnoea.
The sections below take the evidence one condition at a time, and say plainly whether each finding concerns apnoea or snoring.
Blood Pressure: the Strongest Link
The most convincing evidence connects sleep apnoea with high blood pressure, and it comes from following people over time rather than from a single snapshot.
A paper from the Wisconsin Sleep Cohort Study, published in the New England Journal of Medicine in 2000, followed 709 adults who had an overnight sleep study and had their blood pressure checked again 4 years later. High blood pressure was defined as at least 140/90 mmHg measured in the laboratory, or taking blood pressure medication.
The researchers adjusted for blood pressure at the start, body mass index, neck and waist size, age, sex, alcohol and smoking. Compared with people who had no breathing events at all, the odds of having high blood pressure 4 years later were:
- 1.42 times as high with 0.1 to 4.9 events per hour
- 2.03 times as high with 5.0 to 14.9 events per hour
- 2.89 times as high with 15 or more events per hour
Why that pattern matters. The risk rose step by step with the severity of the breathing disruption. The authors described this as a dose-response association that was independent of known confounding factors, and concluded that sleep disordered breathing is likely to be a risk factor for high blood pressure in the general population.
The interesting detail. The first group, 0.1 to 4.9 events an hour, sits below the threshold usually used to diagnose sleep apnoea. Even that minimal level of disrupted breathing was linked with modestly higher odds. This study counted breathing events, not snoring sounds, so it does not show that snoring itself raises blood pressure.
Atrial Fibrillation and Sleep Apnoea
Atrial fibrillation is an irregular, often fast, heart rhythm. A study at the Mayo Clinic, published in Circulation in 2004, compared 151 consecutive patients having a procedure to reset the rhythm (electrocardioversion) with 312 patients from a general cardiology practice who had never had the condition.
Sleep apnoea was identified with the Berlin questionnaire, which in a sample checked against overnight sleep studies showed 0.86 sensitivity and 0.89 specificity. The two groups were similar in age, sex, body mass index, and rates of diabetes, high blood pressure and heart failure.
Apnoea was found in 49 percent of the atrial fibrillation patients against 32 percent of the cardiology comparison group. After adjusting for other factors, the odds ratio for the link was 2.19.
The comparison group was not healthy people. They were patients already seeing a cardiologist, many with other heart conditions, which makes the gap more striking. The authors described apnoea as strikingly more common in atrial fibrillation than in high risk patients with multiple other cardiovascular diseases.
The study compared how common apnoea was in the two groups, so it shows an association rather than which came first. The background to the study notes that apnoea had already been linked to atrial fibrillation coming back after the rhythm had been reset.
Stroke and Coronary Heart Disease
Here the evidence does look at snoring itself, though only snoring as people report it.
A 2014 meta-analysis in Atherosclerosis pooled 8 prospective studies with 65,037 people, comparing self-reported habitual snorers with non-snorers. After adjustment, habitual snoring was linked with:
- a 26 percent higher risk of stroke (hazard ratio 1.26)
- a 15 percent higher risk of coronary heart disease (hazard ratio 1.15)
- no statistically significant difference in cardiovascular disease overall, or in death from any cause
The stroke link appeared stronger in men (hazard ratio 1.54) than in women (1.22).
The authors called habitual snoring a mild but statistically significant risk factor for stroke and coronary heart disease. They were also careful to add that whether the risk comes from obstructive sleep apnoea or from snoring alone remains controversial. Self-reported snoring cannot tell simple snorers apart from people with undiagnosed apnoea, which is exactly the uncertainty they flag.
Heavy Snoring and the Carotid Arteries
The most direct test of snoring on its own comes from the carotid arteries, the large vessels in the neck that supply the brain and run close to the throat.
A study at Westmead Hospital in Australia, published in Sleep in 2008, recruited 110 volunteers, snorers and non-snorers, none of whom had more than mild sleep apnoea or significant drops in oxygen. Each had an overnight sleep study that measured how much of the night they spent snoring, plus ultrasound scans of the carotid and femoral (thigh) arteries.
The prevalence of carotid atherosclerosis, the fatty plaque that narrows arteries, rose with the amount of snoring:
- 20 percent with mild snoring (up to a quarter of the night)
- 32 percent with moderate snoring (a quarter to half the night)
- 64 percent with heavy snoring (more than half the night)
After adjusting for age, sex, smoking history and high blood pressure, heavy snoring was significantly associated with carotid atherosclerosis, with an odds ratio of 10.5. It was not associated with plaque in the femoral arteries, which are far from the throat.
The authors concluded that the increase was independent of other risk factors, including measures of low oxygen at night and sleep apnoea severity.
How much weight to put on it. It is one observational study of 110 people, and the confidence interval around that odds ratio was very wide, from 2.1 to 51.8. The true effect could be much smaller than 10.5. Still, the contrast between neck and leg arteries is what makes the finding interesting, since the neck arteries are the ones close to the snoring.
What This Means If You Snore but Do Not Have Apnoea
Putting the studies side by side gives a fairly consistent picture.
Sleep apnoea. The links with high blood pressure and atrial fibrillation are the clearest, and the blood pressure risk rises with severity. If you have apnoea, it is a genuine cardiovascular issue and worth treating.
Habitual snoring. Linked with a modestly higher risk of stroke and coronary heart disease in pooled studies, but those studies cannot rule out hidden apnoea as the explanation.
Heavy snoring without significant apnoea. One study suggests a link with plaque in the carotid arteries specifically. It is an intriguing finding that needs confirming in larger studies.
So simple snoring is not proven to be harmless for the heart, but nor is it proven to be harmful. The risks that have been measured most firmly belong to apnoea, which is the main reason loud, regular snoring deserves a closer look rather than a shrug.
Does Treating Apnoea Lower Blood Pressure?
If apnoea raises blood pressure, treating it ought to bring blood pressure down. The answer from the trials is yes, but modestly, and mainly in one group.
A 2025 individual patient data meta-analysis in the European Respiratory Journal pooled 36 randomised controlled trials with 9,434 patients that compared CPAP, the mask and air pump used for apnoea, with either a passive or an active comparison treatment. Its background noted that earlier research had found a modest average effect with wide variation between studies.
The key finding was that CPAP lowered blood pressure in patients whose office systolic pressure was uncontrolled at the start, but not in those whose blood pressure was already controlled. Systolic pressure fell by 2.6 mmHg in the uncontrolled group, against 0 in the controlled group. The difference in diastolic pressure (1.7 against 1 mmHg) was not statistically significant.
The authors concluded that people with uncontrolled blood pressure benefit the most from CPAP in terms of blood pressure. Whether the night time oxygen drops were severe made no difference to the result.
In practical terms, nothing in these results suggests CPAP can replace blood pressure medication. Its main purpose is to treat the apnoea itself, and the blood pressure effect is a modest extra for people whose pressure is not yet under control.
What to Do If You Snore
Know your blood pressure. Given the link with apnoea, it is worth having it checked if you snore loudly, especially if you have not had a reading for a while.
Look for apnoea signs. Pauses in breathing that someone has seen, gasping or choking at night, and heavy daytime tiredness are reasons to see a GP rather than to keep putting up with it.
Mention the snoring. If you already have high blood pressure that is hard to control, or atrial fibrillation, tell your GP or cardiologist that you snore. Given the studies above, it is relevant information.
Work on what you can change. Two of the factors you can do something about have their own posts: does losing weight stop snoring and why alcohol makes snoring worse.
Keep snoring aids in proportion. A nasal strip lifts the nostrils open, which is aimed at snoring that starts in the nose. None of the studies in this article tested nasal strips or other snoring aids, so there is no basis for saying they protect the heart, and they are not a treatment for apnoea.
Frequently Asked Questions (FAQs)
Can snoring cause high blood pressure?
The best evidence concerns sleep apnoea rather than snoring. In the Wisconsin Sleep Cohort, people with 15 or more breathing events per hour had 2.89 times the odds of high blood pressure 4 years later, after adjusting for weight and other factors. That study measured breathing events, not snoring sounds, so it cannot show that snoring alone raises blood pressure.
Is simple snoring bad for your heart?
It is not proven either way. Pooled studies link self-reported habitual snoring with a 26 percent higher stroke risk and 15 percent higher coronary heart disease risk, but cannot separate snorers from people with undiagnosed apnoea. One small study linked heavy snoring without significant apnoea to plaque in the neck arteries.
Is sleep apnoea linked to atrial fibrillation?
Yes. In a Mayo Clinic study, 49 percent of patients having treatment for atrial fibrillation had sleep apnoea, against 32 percent of other cardiology patients, with an adjusted odds ratio of 2.19. The study showed an association rather than which came first, so it does not prove that apnoea causes the rhythm problem.
Does CPAP lower blood pressure?
Modestly, and mainly in people whose blood pressure is not controlled. A 2025 analysis of 36 trials and 9,434 patients found systolic pressure fell by 2.6 mmHg with CPAP in people with uncontrolled blood pressure, with no reduction in those whose blood pressure was already controlled. It does not replace blood pressure medication.
Can snoring damage your arteries?
One study suggests heavy snoring might. Among 110 volunteers, carotid plaque was found in 64 percent of heavy snorers against 20 percent of mild snorers, and the link held after adjusting for age, sex, smoking and blood pressure. The study was small and observational, so the finding needs confirming before firm conclusions can be drawn.
Should I get my heart checked if I snore?
A blood pressure check is a sensible, simple step for anyone who snores loudly. If your snoring comes with pauses in breathing, gasping or heavy daytime tiredness, see a GP about possible sleep apnoea, and mention the snoring if you already have high blood pressure or an irregular heartbeat.
Sources
- Peppard PE et al., Prospective study of the association between sleep-disordered breathing and hypertension, New England Journal of Medicine, 2000
- Gami AS et al., Association of atrial fibrillation and obstructive sleep apnea, Circulation, 2004
- Li D et al., Self-reported habitual snoring and risk of cardiovascular disease and all-cause mortality, Atherosclerosis, 2014
- Lee SA et al., Heavy snoring as a cause of carotid artery atherosclerosis, Sleep, 2008
- Pengo MF et al., Effect of CPAP therapy on blood pressure in patients with obstructive sleep apnoea: a worldwide individual patient data meta-analysis, European Respiratory Journal, 2025
This article is general information, not medical advice. If you snore loudly and have high blood pressure, an irregular heartbeat, or pauses in your breathing at night, speak to your GP. In an emergency, such as chest pain, call 999.
