Sleep Apnea and Asthma: What's the Connection?

Quick answer: Sleep apnea and asthma are separate conditions, but they can occur together and may influence each other in some people. Sleep apnea involves repeated pauses in breathing during sleep, while asthma causes airway inflammation and narrowing. Having one condition may worsen symptoms of the other, and both can affect sleep quality and daytime fatigue. Anyone noticing overlapping symptoms should discuss them with your clinician for appropriate evaluation.

What is sleep apnea?

Sleep apnea is a sleep-related breathing disorder in which breathing repeatedly stops and starts during sleep. The most common type is obstructive sleep apnea, where throat muscles relax and block the airway. Central sleep apnea is less common and happens when the brain does not send proper signals to the muscles that control breathing. Typical signs include loud snoring, gasping during sleep, morning headaches, and excessive daytime sleepiness. A sleep study is often used to confirm the diagnosis and measure severity.

What is asthma?

Asthma is a chronic lung condition in which the airways become inflamed and narrow, making it harder to breathe. Symptoms often include wheezing, coughing, chest tightness, and shortness of breath. Triggers can include allergens, exercise, cold air, and respiratory infections. Asthma symptoms may worsen at night, a pattern sometimes called nocturnal asthma. Poorly controlled asthma can disrupt sleep and lead to daytime fatigue, which may overlap with symptoms seen in sleep apnea.

How are sleep apnea and asthma connected?

Researchers have observed that sleep apnea and asthma frequently coexist, and each condition may affect the other. Inflammation from asthma can irritate the upper airway, while repeated breathing pauses from sleep apnea may worsen airway reactivity. Some studies suggest that people with asthma are more likely to develop sleep-disordered breathing, and those with sleep apnea may experience more frequent asthma symptoms. The exact relationship varies by person, and having one condition does not automatically mean you have the other.

Common symptoms that may overlap

Both conditions can cause nighttime coughing, waking up short of breath, and feeling tired during the day. Snoring is more typical of sleep apnea, while wheezing is more typical of asthma. Morning headaches may occur with sleep apnea due to oxygen drops, whereas chest tightness is more common with asthma. Because symptoms can look similar, it can be difficult to tell which condition is causing a specific problem without testing and clinical review.

Comparison: sleep apnea vs asthma

Feature	Sleep apnea	Asthma
Main issue	Breathing pauses during sleep	Airway inflammation and narrowing
Typical timing	During sleep	Day or night, often with triggers
Key sound	Loud snoring, gasping	Wheezing, coughing
Common test	Sleep study (polysomnography)	Spirometry, peak flow
Typical age range	Often adults over 40	Can start at any age

What numbers are typically involved?

Sleep apnea severity is often measured by the apnea-hypopnea index (AHI), which counts breathing events per hour. An AHI under 5 is typically considered normal, 5 to 15 is often mild, 15 to 30 is commonly moderate, and above 30 is typically severe. Asthma control is sometimes assessed using symptom frequency and lung function, such as FEV1 measurements. Many adults with asthma experience symptoms at least once a week, and nocturnal symptoms may occur several nights per month in some individuals. These figures are general ranges and do not apply to everyone.

Steps to take if you suspect both conditions

1. Track your symptoms, including snoring, wheezing, nighttime waking, and daytime tiredness, for one to two weeks.
2. Share your symptom log with your clinician and mention any family history of asthma or sleep disorders.
3. Ask whether a sleep study or lung function test is appropriate based on your history.
4. Follow up on any referrals, such as to a sleep clinic or pulmonology specialist.
5. Review treatment options with your clinician and discuss how one condition might affect the other.

You can compare sleep clinics in the directory to find a location that offers sleep studies and respiratory evaluations. If you are unsure whether your symptoms warrant a specialist visit, the article on signs you should see a sleep specialist may help you decide. For details on what occurs during testing, see what happens during a sleep study.

Frequently asked questions

Can sleep apnea cause asthma?

Sleep apnea is not known to directly cause asthma, but the two conditions may coexist and influence each other in some people. Discussing your full symptom history with your clinician can help clarify the relationship.

Can asthma make sleep apnea worse?

Asthma-related inflammation and nighttime symptoms may contribute to sleep disruption, which could affect sleep apnea symptoms in some individuals. Your clinician can assess whether both conditions need attention.

Should I use a CPAP machine if I have asthma?

CPAP therapy is prescribed for sleep apnea, not asthma. Whether CPAP is appropriate depends on a sleep study diagnosis and your clinician's recommendations.

How do I know if my nighttime symptoms are from asthma or sleep apnea?

Wheezing and chest tightness are more common with asthma, while loud snoring and gasping are more common with sleep apnea. Testing and clinical evaluation are usually needed to tell them apart.

Can treating one condition help the other?

Improving control of either condition may support better sleep and breathing overall, but effects vary by person. Your clinician can guide you on coordinated care.

Where can I find a sleep clinic near me?

You can browse the directory of sleep clinics to locate providers in your area and compare services offered.

This article is for general education and is not medical advice. Always consult your clinician about your personal symptoms and health decisions.