Tuesday, August 25, 2026

by Matt Baker, Physicians Office Resource 

Why primary care physicians may be uniquely positioned to identify one of the most commonly overlooked chronic disorders.

Obstructive sleep apnea (OSA) rarely announces itself in the examination room.

The patient may present with hypertension that has become increasingly difficult to control. Another may complain of persistent fatigue, difficulty concentrating, morning headaches, or poor-quality sleep. A patient with obesity and type 2 diabetes may mention snoring only after being specifically asked. Another may report that a spouse has noticed periods during the night when breathing appears to stop.

Individually, these findings can seem routine. Collectively, they may point toward a disorder that remains substantially underrecognized despite its potential implications for cardiovascular, metabolic, cognitive, and overall health.

OSA is characterized by recurrent episodes of partial or complete upper-airway obstruction during sleep. These events produce reductions or interruptions in airflow despite ongoing respiratory effort and can result in intermittent hypoxemia, sleep fragmentation, intrathoracic pressure changes, and recurrent sympathetic nervous system activation.

The clinical consequences extend well beyond snoring and daytime fatigue. OSA has been associated with hypertension, cardiovascular and cerebrovascular disease, atrial fibrillation, heart failure, type 2 diabetes, cognitive impairment, decreased quality of life, and increased risk of motor vehicle crashes.¹˒² Severe OSA has also been associated with increased all-cause mortality.²

Yet many patients remain unaware that they have the condition.

For primary care physicians, that creates an important opportunity. The first step toward diagnosing sleep apnea may not occur in a sleep clinic. It may begin during a routine hypertension, diabetes, obesity, or annual wellness visit—with a few additional questions about what happens after the patient falls asleep.

A Common Disorder That Frequently Goes Unrecognized

Determining the precise prevalence of OSA is challenging because estimates vary according to population, diagnostic criteria, age, obesity prevalence, and testing methodology.

Data cited by the U.S. Preventive Services Task Force (USPSTF) estimated that among adults aged 30 to 70 years, approximately 14% of men and 5% of women had at least mild OSA accompanied by daytime sleepiness, while approximately 13% of men and 6% of women met criteria for moderate-to-severe disease.²

The prevalence becomes considerably higher in selected clinical populations.

Age, male sex, obesity, craniofacial anatomy, upper-airway characteristics, and family history can increase risk. OSA is also frequently encountered among patients with cardiovascular and metabolic disease.

The difficulty is that having OSA and recognizing OSA are two very different things.

Patients do not necessarily perceive snoring as a medical problem. They may attribute daytime fatigue to aging, stress, parenting, work demands, medications, or insufficient sleep. Others live alone and have no one to observe nocturnal apneas. Some patients have experienced poor sleep for so long that their baseline level of fatigue feels normal.

The result is a condition that can remain hidden for years while clinicians manage its associated symptoms and comorbidities.

The Patient Does Not Have to “Look Like” Sleep Apnea

The traditional image of a patient with OSA—an older man with obesity who snores loudly and struggles to stay awake during the day—is clinically useful but incomplete.

Patients can present very differently.

Classic symptoms include loud habitual snoring, witnessed apneas, nocturnal choking or gasping, nonrestorative sleep, and excessive daytime sleepiness. Other presentations may include morning headaches, nocturia, difficulty concentrating, memory complaints, mood changes, irritability, insomnia, and persistent fatigue.²

Women may be particularly vulnerable to underrecognition when their presentation differs from the classic phenotype. Insomnia, fatigue, headaches, and mood-related complaints can become the dominant symptoms rather than obvious reports of witnessed apnea or profound daytime sleepiness.

OSA also should not be excluded simply because a patient does not have obesity. Body weight is an important risk factor, but upper-airway anatomy, craniofacial structure, age, genetics, and other physiological characteristics can contribute to airway collapsibility.

For clinicians, avoiding phenotype-based assumptions is important.

The better question is not simply, “Does this patient look like someone who has sleep apnea?”

It is, “Does something in this patient’s symptoms, history, or comorbidities suggest that sleep-disordered breathing should be considered?”

Follow the Cardiovascular Clues

The relationship between OSA and cardiovascular disease is one of the strongest reasons physicians should remain alert to the disorder.

During an obstructive event, continued inspiratory effort against a narrowed or closed airway creates substantial changes in intrathoracic pressure. Oxygen saturation may fall, carbon dioxide may increase, and sympathetic activity rises as the patient experiences an arousal that restores airflow.

The cycle can then repeat throughout the night.

Repeated episodes of intermittent hypoxia, sleep fragmentation, oxidative stress, inflammation, endothelial dysfunction, and sympathetic activation have been proposed as mechanisms linking OSA with cardiovascular disease.³

For the primary care physician, certain clinical presentations should therefore increase suspicion.

Hypertension is especially relevant. Patients with OSA frequently have coexisting hypertension, and sleep apnea should be considered as a potential contributor in patients whose blood pressure remains difficult to control despite appropriate therapy.

Atrial fibrillation provides another important clue. OSA is common among patients with atrial fibrillation and other forms of cardiovascular disease.³ A history of heart failure, coronary artery disease, stroke, or pulmonary hypertension may similarly justify closer attention to symptoms suggesting sleep-disordered breathing.

This does not mean that every patient with cardiovascular disease necessarily requires sleep testing. It does mean that sleep should become part of the clinical conversation when the patient’s overall presentation raises suspicion.

Metabolic Disease May Be Another Signal

OSA frequently overlaps with obesity, metabolic syndrome, and type 2 diabetes.

The relationship is complex and likely multidirectional. Obesity increases the risk of upper-airway obstruction, while sleep fragmentation and intermittent hypoxia have been investigated for their potential effects on sympathetic activity, inflammation, glucose regulation, and insulin sensitivity.

The practical implication is straightforward.

When a patient with obesity or type 2 diabetes also reports loud snoring, witnessed apnea, daytime sleepiness, morning headaches, nonrestorative sleep, or resistant hypertension, OSA deserves consideration.

Identifying the disorder may also create an opportunity to address overlapping modifiable risks. For patients with overweight or obesity, weight management can be an important component of OSA care while simultaneously improving broader cardiometabolic health.

Screening and Clinical Evaluation Are Not the Same Thing

One of the most important nuances surrounding OSA involves the word “screening.”

The USPSTF currently concludes that evidence is insufficient to assess the balance of benefits and harms of screening for OSA in the general adult population without recognized symptoms.² This is an “I” statement—not a recommendation against evaluating patients with symptoms or clinical findings suggestive of OSA.

That distinction matters.

Primary care physicians do not necessarily need to implement universal OSA screening across their entire adult population to improve detection. Instead, they can become more deliberate about recognizing patients in whom symptoms, comorbidities, or clinical history raise suspicion.

Validated questionnaires can help structure that assessment.

The STOP-BANG questionnaire incorporates snoring, tiredness, observed apnea, high blood pressure, body mass index, age, neck circumference, and sex. The Berlin Questionnaire and Epworth Sleepiness Scale may also provide useful information in appropriate settings.

However, questionnaires are risk-assessment tools—not diagnostic tests.

A diagnosis of OSA requires objective evaluation rather than a questionnaire score alone.

Clinical Clues That Should Raise Suspicion

In everyday practice, several findings can justify asking additional questions about sleep:

• Loud or habitual snoring
• Witnessed pauses in breathing
• Choking or gasping during sleep
• Excessive daytime sleepiness
• Persistent or unexplained fatigue
• Nonrestorative sleep
• Morning headaches
• Nocturia
• Difficulty concentrating or memory complaints
• Obesity
• Difficult-to-control or resistant hypertension
• Atrial fibrillation
• Cardiovascular disease accompanied by symptoms suggestive of OSA

The presence of one finding does not establish the diagnosis. Instead, these features should help physicians recognize when a more focused sleep history or diagnostic evaluation may be warranted.

Home Testing Has Changed the Diagnostic Pathway

For decades, the diagnosis of sleep apnea was closely associated with overnight polysomnography performed in a sleep laboratory.

Polysomnography remains the standard diagnostic test when OSA is suspected after a comprehensive sleep evaluation.⁴ It can measure sleep stages, airflow, respiratory effort, oxygen saturation, cardiac rhythm, limb movements, and other physiological parameters, allowing clinicians to evaluate OSA while identifying other potential sleep disorders.

But laboratory testing is no longer the only diagnostic pathway for many adults.

Home sleep apnea testing (HSAT) has made objective evaluation more accessible for appropriately selected patients. Current guidance from the American Academy of Sleep Medicine (AASM) recognizes HSAT as an alternative to polysomnography for diagnosing OSA in uncomplicated adults who have signs and symptoms indicating an increased risk of moderate-to-severe OSA.⁴˒⁵

The convenience can be substantial. Testing occurs in the patient’s home, may reduce some of the logistical barriers associated with overnight laboratory testing, and can make diagnostic evaluation easier to incorporate into clinical practice.

However, convenience should not be confused with universal applicability.

The AASM emphasizes that HSAT is a medical assessment that should be ordered following an appropriate medical evaluation. It should not be used as a general screening tool in asymptomatic populations, and diagnosis or treatment decisions should not be based solely on automatically generated device scores.⁵

Furthermore, a negative home test does not always end the diagnostic process. When an HSAT is negative, inconclusive, or technically inadequate and clinical suspicion remains, polysomnography may be necessary.⁴

Laboratory polysomnography is also generally preferred over routine HSAT in patients with certain significant comorbidities or circumstances in which other forms of sleep-disordered breathing may need to be considered.

For primary care clinicians, the message is not that every suspected case requires an immediate referral for laboratory polysomnography. Rather, diagnostic testing can increasingly be matched to the patient’s clinical profile.

Understanding the AHI—And Its Limitations

OSA severity has traditionally been classified using the apnea-hypopnea index (AHI), which represents the average number of apneas and hypopneas occurring per hour of sleep.

In adults, commonly used categories define an AHI of 5 to 14.9 events per hour as mild OSA, 15 to 29.9 as moderate OSA, and 30 or more as severe OSA.

AHI remains central to diagnosis and treatment decisions, but it does not tell the entire clinical story.

Two patients with similar AHIs can experience different degrees of oxygen desaturation, sleep fragmentation, daytime impairment, and cardiovascular risk. Symptoms, comorbidities, oxygenation patterns, event duration, sleep stage, body position, and the patient’s overall clinical picture all matter.

OSA management therefore should not become simply an exercise in treating a number.

Treatment Is More Than CPAP

Positive airway pressure (PAP) therapy remains a cornerstone of OSA treatment.

The AASM recommends PAP therapy for adults with OSA who have excessive sleepiness and supports its use in other appropriate clinical circumstances. Continuous positive airway pressure (CPAP) and auto-adjusting positive airway pressure (APAP) are commonly used to maintain airway patency during sleep.⁶

Effectiveness, however, depends heavily on use.

Mask discomfort, nasal congestion, pressure intolerance, dry mouth, claustrophobia, air leakage, and unrealistic expectations can all undermine adherence. Early education, appropriate mask selection, troubleshooting, and follow-up are therefore integral components of successful therapy.

Patients who struggle with CPAP should not automatically be considered treatment failures.

Oral appliance therapy represents an established alternative for selected adults, particularly patients who cannot tolerate CPAP or prefer another therapy. Guidelines recommend custom, titratable oral appliances provided by qualified dental professionals when this treatment pathway is selected.⁷

Weight management is another important component of care for patients with overweight or obesity. Positional therapy may help selected patients with position-dependent disease. Surgical consultation and other anatomical interventions may be appropriate for carefully selected individuals, particularly when PAP therapy is poorly tolerated or anatomical factors contribute significantly to obstruction.⁸

Treatment therefore should be individualized according to disease severity, symptoms, comorbidities, anatomy, patient preferences, and likelihood of adherence.

Primary Care Can Close the Diagnostic Gap

Primary care physicians are unlikely to manage every component of sleep apnea care—and they do not need to.

Their greatest contribution may come earlier.

Primary care clinicians routinely manage the conditions that frequently coexist with OSA: hypertension, obesity, diabetes, cardiovascular disease, fatigue, insomnia, cognitive complaints, and mood symptoms.

That makes the primary care encounter an ideal place to recognize the pattern.

When hypertension becomes unexpectedly difficult to control, ask about snoring and witnessed apnea.

When a patient complains of persistent fatigue, ask whether sleep feels restorative.

When treating obesity or metabolic disease, consider whether sleep-disordered breathing may coexist.

When a spouse reports that the patient “stops breathing” at night, take the observation seriously.

And when symptoms and clinical history raise sufficient suspicion, move toward objective evaluation rather than assuming the patient’s fatigue, poor concentration, or sleepiness is simply a consequence of lifestyle.

The intervention may take only a few minutes.

The diagnosis may explain years of symptoms.

The Bottom Line

OSA occupies an unusual place in modern medicine: it is common, clinically important, treatable, and yet frequently hidden from both patients and clinicians.

The challenge is not necessarily a lack of technology. Home sleep apnea testing has expanded diagnostic options, polysomnography remains available for more complex cases, and multiple therapeutic approaches now allow treatment to be tailored to individual patients.

The larger challenge may simply be recognition.

Patients rarely schedule an appointment saying, “I think my airway repeatedly collapses while I sleep.”

They present with fatigue.

Hypertension.

Obesity.

Diabetes.

Poor concentration.

Morning headaches.

Atrial fibrillation.

Or a spouse who says the snoring has become frightening.

For physicians, recognizing those clues can change the trajectory of care.

Sleep apnea may occur at night, but its consequences follow patients into the examination room every day. Making sleep part of routine clinical reasoning may be one of the simplest ways primary care physicians can help bring this largely hidden disorder into view.

References

1. Gottlieb DJ, Punjabi NM. Diagnosis and management of obstructive sleep apnea: a review. JAMA. 2020;323(14):1389-1400. doi:10.1001/jama.2020.3514.
2. US Preventive Services Task Force. Screening for obstructive sleep apnea in adults: US Preventive Services Task Force recommendation statement. JAMA. 2022;328(19):1945-1950. doi:10.1001/jama.2022.20304.
3. Yeghiazarians Y, Jneid H, Tietjens JR, et al. Obstructive sleep apnea and cardiovascular disease: a scientific statement from the American Heart Association. Circulation. 2021;144(3):e56-e67. doi:10.1161/CIR.0000000000000988.
4. Kapur VK, Auckley DH, Chowdhuri S, et al. Clinical practice guideline for diagnostic testing for adult obstructive sleep apnea: an American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med. 2017;13(3):479-504. doi:10.5664/jcsm.6506.
5. Rosen IM, Kirsch DB, Carden KA, et al. Clinical use of a home sleep apnea test: an updated American Academy of Sleep Medicine position statement. J Clin Sleep Med. 2018;14(12):2075-2077. doi:10.5664/jcsm.7540.
6. Patil SP, Ayappa IA, Caples SM, Kimoff RJ, Patel SR, Harrod CG. Treatment of adult obstructive sleep apnea with positive airway pressure: an American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med. 2019;15(2):335-343. doi:10.5664/jcsm.7640.