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What Is Obstructive Sleep Apnea? Causes, Risks, and Symptoms
Obstructive sleep apnea is a condition in which the upper airway becomes blocked during sleep, even though your body is still trying to breathe. In other words, airflow stops or is reduced because the airway is obstructed, not because you have stopped making breathing effort. That distinction matters because it helps explain why people with obstructive sleep apnea may snore, gasp, wake often, and feel exhausted even after spending enough hours in bed.
At John H. Kim, DDS, in Irvine, we work with patients who are trying to make sense of symptoms such as loud snoring, unrefreshing sleep, daytime fatigue, and difficulty tolerating CPAP. Many people know they are tired. Many know they snore. Fewer understand that those problems may be connected to repeated airway obstruction during sleep. If that sounds familiar, this is the right place to start.
What happens during obstructive sleep apnea?
During an obstructive event, the airway narrows or collapses while you are asleep. Your chest and abdomen may still be trying to pull air in, but not enough air gets through. That repeated struggle can disrupt normal sleep and keep you from getting the quality of rest your body needs.
This is different from central sleep apnea, where the issue is not an upper-airway blockage in the same way. For this page, the focus is obstructive sleep apnea, because that is the form most people mean when they talk about sleep apnea and the form most often evaluated in relation to snoring, oral appliance therapy, and CPAP alternatives.
What causes obstructive sleep apnea?
At its core, obstructive sleep apnea is an airway problem. The upper airway becomes vulnerable to collapse during sleep. That is the main issue.
There are also factors that can make that problem worse or make it more likely to show up. Weight can be part of the picture for some patients, and alcohol use before bed may make nighttime breathing worse. Smoking has also been discussed as something that can aggravate obstructive sleep apnea by irritating the airway and contributing to inflammation in those tissues.
That said, this is where people get misled. Obstructive sleep apnea is not only a problem for one type of patient. Screening tools often lean heavily toward the classic “older, heavier male” profile, but that does not mean everyone else is in the clear. People outside that stereotype can still have meaningful sleep-disordered breathing.
If you are already noticing snoring, fatigue, poor sleep quality, or problems using CPAP, it may help to read more about sleep apnea symptoms and CPAP alternatives.
Common symptoms of obstructive sleep apnea
Some symptoms are obvious. Others are easier to dismiss.
Loud snoring is one of the most common warning signs. Daytime tiredness, fatigue, and sleepiness are also major clues. Some patients describe struggling to stay awake in meetings, feeling worn out during the day, or waking up feeling bad even after a full night in bed. A bed partner may notice the problem first, especially if they hear loud snoring or observe pauses in breathing. High blood pressure may also be part of the overall picture.
Some people focus only on snoring, but snoring is often the first step toward recognizing a bigger airway issue. Others assume they are “just tired” or blame stress, age, or a busy schedule. That is common, and it is one reason sleep apnea often goes untreated longer than it should.
If you have already been told you snore, wake up unrested, or feel sleepy during the day, a proper evaluation matters more than guesswork.
Why obstructive sleep apnea matters
Poor sleep and insufficient sleep are tied to broad health consequences. In the source material used for this practice, lack of sleep is associated with increased inflammation, diabetes, cardiovascular disease, cognitive problems, and overall mortality. Obstructive sleep apnea can contribute to that bigger picture because disrupted breathing can interfere with restorative sleep.
That does not mean every symptom in your life is caused by sleep apnea. It does mean the condition is worth taking seriously. It is not just about snoring. It is about whether your airway is repeatedly failing you during the night and whether that is affecting your quality of life and long-term health.
How we evaluate sleep apnea concerns
In our office, Dr. Kim reviews your concerns and symptoms, your prior history, and your sleep study. He explains how your sleep study relates to your health and sleep-related symptoms, then reviews treatment options for obstructive sleep apnea, including oral appliance therapy when appropriate. If you move forward with care, you are also referred for follow-up sleep testing with the referring healthcare provider.
That process matters because treatment should be based on real information, not assumptions. If you have already tried CPAP and cannot tolerate it, or if you are trying to understand whether oral appliance therapy may be a better fit, you may also want to review oral appliance therapy for sleep apnea, CPAP intolerance treatment options, or what to expect at your first sleep apnea visit.
When to take the next step
You should not ignore persistent snoring, significant daytime fatigue, or reports that you stop breathing during sleep. Those are not minor issues. They are signs that deserve a closer look.
At John H. Kim, DDS, our practice is focused on sleep apnea, TMJ, and related problems affecting breathing, comfort, and quality of life. If you are in Irvine and want a clearer understanding of what may be happening during sleep, schedule a consultation. We will review your history, discuss your sleep study, and help you understand the next step.
Frequently Asked Questions
Is snoring always obstructive sleep apnea?
No. Snoring and obstructive sleep apnea are not identical. But snoring is a common warning sign, and it is often one of the first clues that the airway may be involved.
What is the main difference between obstructive and central sleep apnea?
Obstructive sleep apnea involves an upper-airway blockage while the body is still trying to breathe. Central sleep apnea is different because the breathing effort changes in a different way.
Can people who do not fit the “classic” sleep apnea profile still have it?
Yes. Screening tools may emphasize traits such as age, neck size, sex, or body size, but those tools do not capture every patient who may have obstructive sleep apnea.
What happens at a sleep apnea consultation in your office?
Dr. Kim reviews your symptoms, health history, and sleep study, explains how the findings may relate to your sleep-related symptoms, and discusses treatment options, including oral appliance therapy when appropriate.
If I cannot tolerate CPAP, does that mean I am out of options?
No. Some patients come to our office specifically because they are looking for CPAP alternatives or want to know whether oral appliance therapy may be appropriate for them.
Have A Question? Reach Out To Us!
Welcome to the practice of Dr. John H. Kim! We look forward to serving you.
Contact Info
17305 VON KARMAN AVE.
SUITE 204 IRVINE, CA 92614
Business Hours
Mon - Tues
9:00 am - 5:00 pm
Wednesday
Closed (at Kaiser Sleep Clinic)
Thursday
9:00 am - 5:00 pm
Friday
Closed (at Kaiser Sleep Clinic)
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