Summary: Asthma and obstructive sleep apnea occur together more often than chance would predict, and each appears to make the other harder to control. They also share several contributors, including nasal obstruction and reflux. Asthma is managed by a physician. What a dental sleep practice can contribute is on the airway side, and only after a medical diagnosis.
What this article covers
- How often the two conditions occur together
- Why each condition can make the other harder to control
- Symptoms that get attributed to the wrong condition
- What the two conditions share
- Where a dental sleep practice fits, and where it does not
- Frequently asked questions
If your asthma is well controlled during the day but the nights are still rough, it is worth asking whether asthma is the only thing happening at night.
Asthma and obstructive sleep apnea are separate conditions with separate treatments, but they show up together far more often than coincidence would explain, and the symptoms overlap enough that one frequently gets credited for the other's effects. This guide covers what is known about the connection, which symptoms are easy to misattribute, what the two conditions have in common, and where the line sits between what a physician handles and what a dental sleep practice can contribute.
How often the two conditions occur together
Obstructive sleep apnea appears at higher rates among people with asthma than in the general population, and the relationship appears to run in both directions. A 2015 study published in JAMA, drawing on the long running Wisconsin Sleep Cohort, found that participants with asthma were more likely to develop obstructive sleep apnea over the follow up period than those without it.
The co-occurrence is common enough that the literature has a name for it, sometimes called the alternative overlap syndrome to distinguish it from the overlap of sleep apnea with chronic obstructive pulmonary disease. What it means practically is that a patient being treated for one condition is a reasonable candidate to be screened for the other, which is part of why the airway conditions we evaluate in adults include asthma and chronic congestion alongside snoring.
Association is not causation, and neither condition causes the other in any simple sense. What the evidence supports is that having one raises the likelihood of the other and complicates its management.
Why each condition can make the other harder to control
The mechanisms proposed for the relationship are plausible in both directions, which is part of why it is difficult to untangle.
Untreated sleep apnea involves repeated collapse of the upper airway, and each of those events produces a spike in inflammatory activity and a shift in pressure inside the chest. Both are thought to contribute to airway inflammation and to reflux, which is itself a recognized trigger for nocturnal asthma symptoms. Fragmented sleep also leaves less recovery time. The full picture of what happens during sleep apnea and snoring explains why the consequences extend beyond feeling tired.
Running the other direction, asthma involves chronic inflammation of the airways, and nasal inflammation from the allergic conditions that often accompany it pushes breathing toward the mouth. Mouth breathing during sleep removes the stabilizing effect of nasal airflow and tends to hold the jaw open, both of which make upper airway collapse more likely. Some asthma medications and disrupted sleep architecture are also discussed in the literature as contributors.
Symptoms that get attributed to the wrong condition
This is where the overlap causes real problems. Several symptoms belong plausibly to either condition, and when someone already has an asthma diagnosis, the familiar explanation tends to absorb everything.
Waking at night short of breath, coughing after lying down, morning headaches, chest tightness on waking and persistent daytime fatigue can all come from either source. So can the sense that sleep is not restorative even after a full night. Snoring, witnessed pauses in breathing, and gasping or choking during sleep point more specifically toward sleep apnea, but they are often not noticed unless someone else is there to observe them.
The pattern worth flagging to a physician is asthma that stays difficult at night despite treatment that works during the day. That specific combination is the one most likely to be hiding a second problem.
What the two conditions share
Several contributors show up in both conditions, which partly explains the overlap. Nasal obstruction is the clearest one: allergic rhinitis, chronic congestion and structural narrowing all push breathing toward the mouth and affect both conditions at once. Reflux is another, aggravating nocturnal asthma symptoms and associated with sleep apnea in both directions. Body weight is a shared risk factor for sleep apnea and is discussed in relation to asthma control as well, and it belongs in a conversation with your physician rather than in a blog post. In children, the picture involves the same airway and growth factors that we screen for, since allergies and mouth breathing during development influence both breathing and facial growth.
The shared factors are worth knowing because addressing one of them can improve more than one problem. Nasal breathing in particular is a thread that runs through both conditions.
Where a dental sleep practice fits, and where it does not
Asthma is a medical condition diagnosed and managed by a physician, usually a primary care provider, pulmonologist or allergist. Nothing offered here treats asthma, and no dental appliance should ever be presented as an asthma treatment. That boundary is not a formality.
Obstructive sleep apnea is also a medical diagnosis, typically confirmed by a sleep study ordered by a physician. Where a dental sleep practice contributes is afterward, in delivering oral appliance therapy for appropriate candidates, in coordination with the diagnosing physician. The American Academy of Dental Sleep Medicine describes this as a collaborative model rather than a parallel one.
The practical value for a patient with asthma is often simpler than that. Screening questions, an evaluation of how you breathe and where the tongue and jaw sit, and a referral for a sleep study when the signs warrant it are all reasonable first steps. If a diagnosis follows, the treatment options for sleep apnea are worth understanding before choosing one, and that decision stays a joint one with your physician.
Managing asthma but still sleeping badly? Schedule an airway evaluation with our Orlando team and bring your physician into the conversation.
