Common Problems

Swallowing Air with CPAP (Aerophagia): Causes and Solutions

Continuous positive airway pressure (CPAP) therapy provides a consistent flow of air to help keep your upper airway open to prevent it from collapsing while you’re sleeping. When tolerated and patients are compliant, it’s extremely effective for preventing Sleep Apnea.

But, this doesn’t mean using a CPAP machine comes with no side effects. Some patients experience CPAP-related gas due to aerophagia.

What is Aerophagia?

Aerophagia definition:

Aerophagia is excessive air swallowing. It’s a condition that occurs when you have air entering your gastrointestinal tract, including your intestines and stomach. As this air builds up, it can cause significant discomfort in your bowels and belly. The most common aerophagia symptoms are:

  • Stomachache
  • Belly bloating
  • Flatulence
  • Heartburn and acid reflux
  • Burping
  • An uncomfortable “full” feeling

Anybody can experience aerophagia, even individuals who don’t use CPAP and those who don’t have Sleep Apnea.

Causes of Swallowing Air with CPAP

Some causes of aerophagia may include:

  1. Pressure is set too high: Your CPAP pressure could be set too high or higher than you need. The extra air you get has no place else to go, but to your esophagus and then belly.
  2. Pressure is set too low: You may have your pressure set too low where it’s too inadequate to resolve your apnea episodes. As you’re trying to obtain more air in your lungs, you end up quickly gulping air which is forced into your esophagus instead.
  3. Nasal congestion: You could have nasal congestion from allergies, a cold or the flu. When you have a stuffy nose, you might not be able to get the right CPAP air pressure you require, therefore you gulp the air by mouth and there it goes, down into your esophagus.
  4. Mouth breathing: You might be a mouth breather and wears a traditional nasal mask. When your mouth opens up while you’re sleeping, the CPAP machine may not be able to deliver the air to your longs, but rather the air escapes through your mouth. Your apnea episodes aren’t being corrected, therefore in your unconscious panic; you could suddenly experience a choking sensation and gulp the air in rapidly, forcing it into your esophagus.
  5. Exhalation problems: You might be having trouble exhaling over the consistent air pressure CPAP delivers. This is particularly hard for individuals using mid- to high-CPAP pressures. When you inhale high pressures, it might be simple, but exhaling might cause panic, anxiety and a feeling of choking or suffocation. When this occurs, you might fall out of your natural breathing rhythm and start hyperventilating. This may lead to quickly gulping or sucking in air, forcing it into your esophagus instead of your lungs.

Solutions for Swallowing Air with CPAP

If you’re swallowing air with CPAP, here are some aerophagia solutions you can try:

1. Check the Pressure Settings

If you think your CPAP device’s air pressure isn’t adequate (too low or too high), talk with your doctor or sleep professional about a pressure change. Confirm the machine is set correctly per your doctor’s prescription with your CPAP provider. Occasionally, mistakes can occur and your CPAP won’t be set correctly.

2. Check Your Mask

Figure out if you’re using the wrong mask. For instance, a nasal mask isn’t the best choice if you’re a mouth breather. Your mask might not be the best style or size for your face. If you’re experiencing pressure point soreness from the straps being too tight or a frequent mask leak, consider picking a different mask.

Ensure you know how to fit and adjust your mask properly for the best seal. Once you’ve selected the best mask style and size for your face, you need to properly adjust it before going to sleep. Turn your machine on and put the mask on your face with loose straps. Lie down in the same position you normally do when sleeping with head on the pillow. Then, pull the straps slowly until you acquire a good seal. If there’s a dual cushion in your mask, it will need to be seated.

Once you’ve adjusted and fitted the mask, you’ll pull the mask out gently and away from your face to “seat” it and allow the dual cushions to properly inflate. Gently place the mask back onto your face. You should know by how it feels if it’s a comfortable seal.

3. Obtain Expiratory Pressure Relief

Most CPAP machines today have expiratory pressure relief features. They may be called BIFLEX or AFLEX, depending on the machine brand. This feature reduces air pressure automatically upon exhalation and could help decrease or eliminate aerophagia. Talk with your CPAP provider to see if you have this feature enabled on your machine. You need to control this feature manually, so be sure you ask how to use it.

4. Adjust Your Sleep Position

Your sleep position is another essential factor. If you normally sleep on your back, it might be better to sleep at an incline which can prevent a “kink” in your esophagus that could cause it to easily allow air flow into your stomach. Many individuals find sleeping with their head up at a 30 to 40 degrees angle to be helpful. You can use a pillow wedge to accomplish this.

5. Try a BiPAP Machine

Bilevel positive airway pressure machines, or BiPAP machines can help relieve aerophagia symptoms. For individuals suffering from aerophagia as a CPAP side effect, the BiPAP machine’s bilevel delivery system means you’ll have less air during exhalation being “pumped in” and this means it’s less likely you’ll have air entering your esophagus instead of your windpipe.

6. Try an APAP Machine

Automated positive airway pressure, or APAP machines, connect with a non-invasive mask connected to a pressure generator designed for delivering air pressure to maintain open airways while you’re sleeping.

In one study, switching from a CPAP machine to an APAP machine led to reduced aerophagia symptom severity. The group of patients being treated with APAP saw substantially decreased median therapeutic pressure levels when compared with the patients using CPAP.


Figuring out what’s causing your aerophagia is essential to resolve it. Extreme air swallowing can be very uncomfortable, particularly if your CPAP settings aren’t optimized. Be sure to talk with your CPAP sleep doctor about this problem to help determine the causes and solutions unique to you. You can also call us here at at 1-800-356-5221 or use our live chat feature to talk to one of our CPAP experts.

David Repasky has been using CPAP treatment since 2017 and has first-hand experience with what it’s like to live with Sleep Apnea. He brings the patient’s perspective to the blog and has received formal training in CPAP machines, masks, and equipment.


  1. Cesar Gubaton Reply

    I am using Res med cpap machine air sense 10 and air touch F-20 large mask. My problem is with the mask. I wake up middle of the night and my mask is leaking and dry mouth. I tried using the medium size but it give me the same result. My cpap machine is set to 12% air flow. How can I solve this problem, please help!

    • Hi Cesar, I am sorry to hear that you are having a problem with your mask leaking. Have you been fitted for the correct size mask? Also, have you tried any other full face masks? Keep in mind that not all masks will work for everyone. You may want to try a different mask if you are not able to get a good fit and keep a seal with the AirFit F20.

      If you would like assistance with troubleshooting your mask leak, or maybe selecting a different mask we will be more than happy to assist you. We can be reached at: 1-800-356-5221.

      Enjoy your day!

  2. Thomas McKenna Reply

    Hi, I am a 2 year CPAP user. Approximately 1 year, or so, ago, I began having stomach aches, every morning after 6–8 hours of sleep. They are above my belly button side to side. No belching, maybe a hiccup once and a while and gas only from time to time. My pressure was lowered from 14 to 12. No relief. The ache goes away a few hours after I’m upright for the most part. I’m seeing a specialist soon to see what’s up. My events are still below .5. I use full face mask. Amara View. Very limited moisture due to sinus stuffiness at high moisture.

    • Hi Thomas, i’m very sorry to hear that you are experiencing some discomfort during your therapy. I hope your specialist is able to make adjustments to your settings to provide you some relief.

      We’d love to hear what advice your specialist gives you, if you’d like to share!

      Enjoy your day!

  3. A couple of times I have awakened to an extremely dry mouth and throat and my heart pounding. My throat and mouth are so dry I cannot swallow without water. Scary!

    • Hi Debra, I am sorry to hear that you are experiencing some side effects while treating your Sleep Apnea. The symptoms that you are having with dry mouth and throat, is an indication that your mouth is falling open during your sleep. What type of mask are you using? If you are currently using a Nasal, or Nasal Pillow Mask which is comfortable for you, I would encourage you to use a Chin Strap also. You may also consider changing to a Full Face Mask, this will allow your nose and mouth to be covered during your sleep. Are you using a humidifier? If not this could possibly decrease the dryness that you are feeling. If you are using a humidifier, you may need to increase the humidity.

      Please see the link below for other FAQ’s to other side effects that you may experience with the use of CPAP Therapy.

      If you would like to go through troubleshooting over the phone, or need assistance with adjusting your settings to your comfort, please feel free to reach us at: 1-800-356-5221.

      We wish you the best!

  4. I have a respiring sure dream station biosphere machine. Have used it for about 4 years. Hugely improved quality of my sleep. However I’ve had tremendous difficulty swallowing air. Terrible pain. Some adjustments in pressure make it worse some only slightly better. In the last 2-3 months I’ve had aching in the left side of my chest. Worse in the morning, better as the day progresses, gone by nite. I tried all kinds of things to see what might be causing it. Finally 2 nites ago slept without using my machine and the aching was essentially gone. So I’m pretty sure it’s related to swallowing air. Should I be concerned. What are my options? Would an APAP machine be better for me? Thanks

    • Hey Lisa, i’m glad to hear that your therapy has improved your sleep quality. Swallowing air during CPAP Therapy is a common problem. Please see the link below for information on the effect that you are experiencing.

      Also, if you are currently using a CPAP Machine (single pressure) and it is providing more pressure than you feel is needed, an APAP machine could help solve the problem. This is a machine that will provide the amount of pressure that you need on a breath-by=breath basis.

      I would encourage you to speak with your doctor about how you are feeling, this will ensure that you are being provided proper guidance and getting the most optimum treatment catered to meet your needs.

      For further questions, or concerns, please feel free to reach us at: 1-800-356-5221, or e-mail us at:

      Have a wonderful day!

      • I got my cpap machine just recently. Have only one lung and find that am unable to use is as my abdomen is so distended and hard within 10min. Do you think having only one lung is causing the air to go via oesophagus in abdomen. I had to rip it off after 15mins.

        • Hi Gail, my apologies, but i’m not certain. My suggestion, would be for you to speak directly with your doctor. Your doctor, may find that an adjustment to your settings is required. Also, keep in mind, that it may take more time for you to become acclimated to using CPAP Therapy.

          We wish you the best!

  5. I a a brand new CPAP user. The first few night were fine. Then, I began to be awakened by my mouth being full of air to the point where I have to expel it in a big burst of an exhale. I keep my mouth closed while I sleep, so it is like a balloon bursting.
    Any advice?

    • Hi Joanne, my apologies for the delay. There are a few suggestions you may consider. You may try sleeping in a different position such as, lay on the left side or rotate to the right side. Incline with pillows or lay flat. Also, you may want to speak with your doctor, as they may make a medical decision to lower your pressure. A lot of customers benefit from using an APAP, this is a machine that auto-adjusts your pressure on a breath-by-breath basis.

      Please feel free to reach us at: 1-800-356-5221, or you may e-mail us at:, with any further questions, or concerns.

      We wish you the best!

  6. I have been using my Resmed 10 CPAP Machine off and on for about 6 weeks. Tried many different masks and adjustments.

    But one problem remains: about 1 1/2 – 2 hours into the therapy every night, I am suddenly awaken by a confusion of air pressure in my full face mask. I suddenly feel as though I’m not getting enough air or I’m getting an influx of too much air. The best sleep I’ve ever done without pressure interruption is about 4 – 5 hours. Yet to have a full 8 hour sleep.

    I immediately remove the mask and do not use it CPAP for the remaining night.

    I don’t think it is a mask leak issue because most of the time my machine registers a green face indicating a good seal most of the time after one of these episodes.

    I tried adjusting the ramp pressure with mixed results.

    I should mention that I am a side sleeper and mouth breather. I was told only a full mask will work best for me.

    Your thoughts on this.

    • Hi Wayne, i’m sorry to hear that you’re having problems with your CPAP Therapy. Unfortunately, I am not certain as to what may be causing the issue with too much, or too little pressure.

      I would recommend you speaking with your doctor about your concerns since they are able to analyze your data and determine if a setting adjustment, or another change of mask is warranted.

      We wish you the best!

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