Sleep apnea doesn’t kill you outright overnight, but untreated obstructive, central, or mixed sleep apnea repeatedly lowers blood oxygen during sleep, raising long-term risk for stroke, heart disease, dementia, and diabetes. Only moderate to severe cases carry serious risk, but sleep apnea can hide in plain sight and is greatly underdiagnosed. If you have possible symptoms, it’s important to get evaluated through a home or in-patient sleep study and, if diagnosed, get treated with a properly fitted CPAP machine.

In conversations with patients about sleep apnea, one question that comes up almost every time is this: Can sleep apnea kill you?

Well, yes and no.

As with many answers in medicine, this response isn’t quite as straightforward as you might have hoped. So, here, we’ll look into the details of sleep apnea for a more satisfactory response so you’ll have the information you need to effectively care for your health.

Can Sleep Apnea Kill You? The Details

Sleep apnea is a disease process that doesn’t have immediate, dramatic health effects starting the night you develop it. That’s the “no” part of my answer. The “yes” element, however, comes from the cumulative dangers of sleep apnea over time.

Every untreated night, your brain and heart absorb a little more stress, and that stress eventually shows up as serious disease.

On the brain side, low oxygen contributes to degenerative neurological problems, raising your risk for issues like stroke, dementia, and Parkinson’s disease, while also promoting problems with anxiety, depression, and overall mood.

On the heart side, that same stress elevates blood pressure and can trigger arrhythmias, irregular heartbeats that raise your risk of fatigue and clots, along with arterial buildup, heart disease, and heart attacks over time.

So while sleep apnea doesn’t kill you outright in a single night, it can absolutely shorten your life if left untreated.

What Is Sleep Apnea?

Generally speaking, sleep apnea is the intermittent cessation of breathing during sleep. It comes in three types:

• Obstructive sleep apnea is by far the most common. Soft tissue in your throat relaxes while you sleep, blocking your airway and causing you to stop breathing repeatedly throughout the night. An estimated one in three American adults have some degree of this type of sleep apnea, with a possible 80% going undiagnosed.
• Central sleep apnea is far less common and works differently. In this form of the condition, your brain’s signals to breathe are interrupted, so your body “forgets” to take a breath.
• Mixed or complex sleep apnea involves both mechanisms working together.

Regardless of type, the result is the same. You breathe less, your blood oxygen drops, and your body responds by elevating stress hormones like cortisol. That constantly elevated cortisol raises your risk for:

• Diabetes
• Heart disease
• Gastrointestinal problems that affect metabolism and immunity
• Inflammation that shows up as arthritis, fatigue, and more
• Disrupted hormone pathways that affect libido and sexual function

Warning Signs of Sleep Apnea

Some signs of sleep apnea are obvious. Others hide in plain sight because they overlap with so many other conditions.

Obvious signs include:

• Loud, chronic snoring
• Night sweats
• A sleep partner saying you stop breathing during sleep
• Waking up frequently throughout the night

The subtler signs are easy to dismiss because they mimic other complaints:

• Brain fog
• Fatigue and daytime sleepiness, even after adequate hours of sleep
• Headache upon waking
• Sexual dysfunction

Unfortunately, since many of these symptoms escape notice, sleep apnea often hides in plain sight.

Maybe you brush off your snoring and daytime sleepiness because they’re so common, or you blame your mood changes on stress at work. Or maybe you sleep alone, or your partner is a heavy sleeper, so no one can tell you about the more obvious signs of snoring or pauses in your breathing.

This is why having an open and ongoing dialogue with a physician you trust is so important. I want my patients to tell me about whatever they’re experiencing, whether it seems important or not, which means they need adequate time in each appointment to do so.

If several of the above symptoms sound familiar, it’s worth a conversation with your doctor rather than writing them off as aging or stress. As a physician, I always have sleep apnea in the back of my mind as a possible route of investigation for such symptoms. When patients bring them up, I can then take the appropriate steps to seek a diagnosis and investigate contributing factors.

How We Diagnose Sleep Apnea

Diagnosing sleep apnea comes down to a sleep study, for which you have two general options:

• A home sleep study is the convenient version. You sleep in your own bed, and specialized tools measure your nasal breathing, chest movement, and blood oxygen levels. The downside is that home studies aren’t as sensitive as the other type and can miss central or mixed sleep apnea.
• An in-patient sleep study adds scalp electrodes to track brain waves, offering far greater sensitivity. I favor this option for patients with heart disease, prior stroke, or seizure disorders, and it’s essential for anyone in a safety-critical job, like pilots, drivers, or military service members, where daytime sleepiness can have serious consequences.

I always want a board-certified sleep specialist involved when we review these studies, especially at initial diagnosis. They determine whether the patient’s sleep apnea is mild, moderate, or severe, and determine whether and what level of treatment is needed.

Treatment: Simple, but Not One-Size-Fits-All

The good news is that for all the harm sleep apnea can cause, its main treatment is refreshingly simple: a continuous positive airway pressure, or CPAP, machine.

Today’s CPAP machines are far smaller and quieter than the bulky units of decades past. You wear a mask connected to a small machine that gently pushes air through to keep your airway open all night. It takes adjustment, but it’s effective once you’re used to it.

That said, treatment is never one-size-fits-all. Other conditions, weight, sleep position, machine settings, and mask fit all play a role, and getting the mask right takes a knowledgeable therapist and often some trial and error.

Adherence is one of the harder parts of treatment. By some estimates, up to 80% of patients struggle to consistently use their CPAP as prescribed, which is why individualized troubleshooting matters.

Why Personalized Care Matters for Sleep Apnea

One patient of mine illustrates the importance of a detailed, personalized approach to treating sleep apnea.

He had sleep apnea and several other conditions, and he’d stopped using his prescribed CPAP machine because he couldn’t tolerate wearing it. It looked at first like the CPAP was triggering panic attacks. Upon further investigation, we found that his mask didn’t fit well, making him feel breathless while wearing it.

To complicate matters, he also had acid reflux, which we discovered was caused by an unrelated medication. That reflux worsened his mask intolerance, which fed his anxiety, worsened again by poor sleep.

Without an environment in which he could bring up these issues and work with his physician to investigate them, my patient would have been left to simply give up on his sleep apnea treatment. And that is a dangerous prospect.

Sleep apnea can be confused with other problems, compounded by them, and sometimes even caused by them, which is why a good doctor-patient relationship and a thorough history at every appointment matter.

Can Sleep Apnea Kill You? The Bottom Line

So, can sleep apnea kill you? Not immediately, but left unaddressed for years, it raises your risk for the conditions that do. The reassuring part is that evaluating for sleep apnea is straightforward, and once we understand your situation, we can build a treatment plan around you.

In the meantime, a properly fitted CPAP does something simple but powerful: It makes sure you keep breathing, all night, every night, protecting sleep as one of the Four Pillars of Health.

Remember, though, that sleep apnea hides in plain sight. Symptoms like daytime sleepiness, trouble managing weight, difficult-to-control blood pressure, or a partner saying your snoring has worsened are easy to brush off. But you can’t know if sleep apnea is involved unless you talk with your doctor and get tested.