Sleep Apnoea Risk Factors: What You Can and Cannot Change
- The biggest modifiable sleep apnoea risk factors are excess weight, a large neck, alcohol, smoking and a blocked nose.
- The main fixed factors are being male, getting older, family history and the shape of your jaw and airway.
- These are population-level risks, not a diagnosis. Only a sleep study can diagnose sleep apnoea, so any worries belong with your GP.
Snoring and obstructive sleep apnoea (OSA) share a cause: a narrowed airway during sleep. Most sleep apnoea risk factors either crowd that airway or relax the muscles holding it open. Some you can change, and some you cannot. Knowing which is which helps you decide what to try and when to talk to a doctor.
What are the modifiable risk factors?
These are the things you have some control over. They matter, because more than half of OSA prevalence is linked to excess body weight alone.
| Factor | Why it raises risk |
|---|---|
| Excess weight | The single strongest factor. Odds of OSA rise about 14% per BMI unit. |
| Large neck | A neck over about 40 cm crowds the airway. |
| Alcohol | Relaxes airway muscles, which raises the apnoea-hypopnoea index. |
| Smoking | Inflames and narrows the airway. Current smokers carry higher odds. |
| Blocked nose | Congestion and nasal symptoms make snoring more likely. |
The encouraging part is that progress is measurable. Losing 10 to 15% of body weight can roughly halve the apnoea-hypopnoea index. If you are changing one of these habits, tracking with Kip shows you whether your snoring loudness and frequency are actually shifting, night to night. See our deep dives on snoring and weight and snoring and alcohol for the detail.
What are the fixed risk factors?
Some things you cannot change, but it still helps to know them.
- Sex. OSA is roughly 2 to 3 times more common in men than women.
- Age. Risk rises until about 65, then levels off.
- Family history. Around 35 to 40% of the variance in OSA is genetic.
- Jaw and airway shape. A set-back lower jaw or large tonsils narrow the airway.
- Menopause. Postmenopausal women carry roughly 2 to 3 times the odds of premenopausal women.
A fixed factor is not a verdict. It simply nudges the odds, which is a good reason to keep an eye on your sleep. See snoring and age and snoring in women for more.
When should I see a GP?
If loud snoring comes with breathing pauses, gasping, choking or daytime exhaustion, book an appointment. Several risk factors stacked together is a sensible reason to start that conversation. For more on the bigger picture, read snoring vs sleep apnoea. Kip is a wellness and screening tool, not a medical device. It tracks snoring on your phone and the audio never leaves the device. An app cannot diagnose anything.
Sources
- NHS: Sleep apnoea
- Epidemiology of Obstructive Sleep Apnea: a Population-based Perspective (Punjabi, 2008)
- The Impact of Alcohol on Breathing Parameters during Sleep (Kolla et al., 2018)
FAQ
What is the biggest risk factor for sleep apnoea?
Excess body weight is the strongest factor you can change. More than half of OSA prevalence is linked to it, and the odds rise with each unit of BMI. Losing 10 to 15% of body weight can roughly halve the number of breathing events per hour.
Can you have sleep apnoea without being overweight?
Yes. Fixed factors like a set-back jaw, large tonsils, family history, age and being male can raise risk in people of any weight. That is why a sleep study is needed rather than a glance at the scales, and why a GP is the right place to start.
Does family history of snoring matter?
It does. Roughly 35 to 40% of the variation in sleep apnoea is genetic, and the craniofacial features that narrow the airway are inherited. If a close relative has OSA, you are more likely to snore or have breathing pauses, so it is worth mentioning to your GP.