CPAP Troubleshooting: 12 Common Problems & Fixes

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Most people who quit CPAP therapy don't quit because the diagnosis was wrong. They quit because a fixable side effect turned every night into a small war, and nobody explained the fix. Dry mouth, stomach bloating, a leaky seal that wakes you up at 3am: these are all solvable problems with known fixes, and you don't need to be a sleep doctor to work through them.

If you'd rather have the tool walk you through it, use the CPAP Troubleshooter to pick your symptoms and get a ranked list of fixes. Otherwise, this guide covers the 12 most common CPAP problems and what resolves each of them, from the cheapest fix to the "call your doctor" last resort.

1. Dry mouth or throat

This is the #1 complaint and usually the easiest fix. Dry mouth happens when air escapes through your mouth at night: either because you sleep with your mouth open, or because your mask leaks around the seal.

The fix, in order:

1. Turn up the humidifier. Most machines ship with humidity set to 3 or 4 out of 8. Crank it to 5 or 6. If your climate is very dry (desert, winter in a heated house) go to 7. Make sure you have a fresh humidifier chamber (opens in new tab) and clean it weekly.
2. Try a chin strap. If you're a mouth breather, no amount of humidity will save you; the air escapes faster than your mouth can stay wet. A basic chin strap (opens in new tab) runs about $15 and is the single most effective fix for mouth-breathing-induced dry mouth.
3. Switch to a full face mask. If a chin strap doesn't work or is uncomfortable, a full face mask seals over your mouth and nose, which eliminates the problem entirely.

2. Bloated stomach (aerophagia)

Aerophagia is swallowing air during therapy. You wake up bloated, burping, or with gas that wasn't there before CPAP. This is almost always a pressure problem: your prescribed pressure is higher than your airway actually needs, and the excess pushes air down your esophagus.

The fix:

1. Lower or disable EPR. Expiratory Pressure Relief drops pressure when you exhale. Counter-intuitively, high EPR can make aerophagia worse for some users because the pressure swing triggers swallowing reflexes. Try EPR 1 or EPR off and see if the bloating stops.
2. Ask your sleep doctor to lower your pressure. If EPR changes don't help, your prescription pressure is likely too high. A sleep doctor can run a titration review and bring it down. Don't change pressure yourself: this is a prescription change and your insurance paperwork depends on it.
3. Sleep on your side. Side sleeping reduces the amount of air swallowed because your airway stays more open, so you need less CPAP pressure to achieve the same result.

3. Mask leaks at the top (air blowing into your eyes)

This is always a fit problem, and it almost always starts with an old cushion.

The fix, in order:

1. Check the cushion age. Silicone cushions harden after 4-6 weeks of nightly use. A hardened cushion can't form a seal at the top of your nose, so air blows upward. Replace with a fresh OEM cushion (opens in new tab). They're cheap and make a bigger difference than you'd expect.
2. Tighten the bottom straps, not the top. Most people tighten the top straps when they get a leak, which just makes it worse. Loosen the top, tighten the bottom, and let the cushion seat itself under the pressure.
3. Switch to a nasal pillow mask. If you've been fighting leaks for months, the mask type is probably wrong for your face shape. A nasal pillow mask (opens in new tab) has almost no top-seal area and is much easier to fit.

4. Mask leaks at the side

Side leaks are usually a jaw problem: your mouth falls open at night, which drops your jaw and breaks the side seal.

The fix:

1. Try a chin strap. Same one mentioned above: $15 on Amazon and it fixes side leaks in most users.
2. Replace the cushion. As with top leaks, an old cushion is the first thing to rule out.
3. Switch to a full face mask if the chin strap is uncomfortable. Full face masks are designed for mouth breathers and handle jaw drop without losing the seal.

5. Nose stuffiness or congestion

CPAP dries out your nasal passages, which triggers a rebound inflammation that presents as stuffiness. This is basically a mild nasal irritation, not an allergy.

The fix:

1. Turn up the humidifier and use a heated tube if you have one. The heated tube prevents "rainout" (condensation in the hose) and keeps air moist all the way to your nose.
2. Saline spray at bedtime. Over-the-counter saline spray before you put the mask on reduces rebound inflammation within a week.
3. Ask about nasal steroids. If humidifier + saline don't fix it within two weeks, a course of nasal steroid from your doctor is the next step. This is common enough that most sleep doctors prescribe it without a separate visit.

6. Sore spot on nose bridge

Red mark, soreness, or skin breakdown where the mask sits on your nose bridge. This is a pressure-point problem and it gets worse the longer you ignore it.

The fix:

1. Loosen the top straps. Most users over-tighten to prevent leaks. Back off until the mask barely stays on your face, then see if the leak is actually a problem or if you were fighting a ghost.
2. Switch to a nasal pillow mask. Nasal pillows don't touch the nose bridge at all. Problem solved in one swap.
3. Nose bridge pads. If you can't switch masks, gel pads or cloth pads (opens in new tab) protect the skin while you figure out the longer-term fix.

7. Claustrophobia / mask anxiety

The mask feels suffocating. You wake up tearing it off, or you can't even get to sleep with it on. This is common in the first 2-4 weeks and almost always eases with desensitization.

The fix:

1. Enable ramp. Ramp starts therapy at a low pressure and gradually climbs to your prescribed level. Set ramp to 20 or even 45 minutes so you fall asleep before the full pressure kicks in.
2. Wear the mask daytime. Put the mask on while watching TV or reading for 30 minutes a day for a week. This decouples the mask from the anxiety of trying to sleep.
3. Switch to a nasal pillow mask. Pillows touch less skin and feel much less suffocating than nasal or full-face masks. If claustrophobia is the blocker, a mask type change is usually the cure.
4. Read the CPAP adjustment period guide for a 14-day desensitization schedule.

8. Mouth breathing

Your mouth falls open and pressure escapes through it. Same root cause as dry mouth, but worth calling out separately because the fix is identical.

The fix:

1. Chin strap (opens in new tab). $15. Solves this in 80% of users.
2. Full face mask. If the chin strap is uncomfortable, switch to a mask that covers your mouth.
3. Mouth tape. This is a last-resort option: discuss with a doctor first to make sure you don't have a nasal obstruction that would make taping dangerous.

9. Noisy machine or mask

Modern CPAPs are quiet: the AirSense 11 runs around 27 dB. If yours is noticeably loud, the problem is usually an aging machine, a leaking connection, or a worn-out mask diffuser.

The fix:

1. Check every connection. Pull the hose off the mask and off the machine, inspect both ends for cracks or deformation, and reseat them firmly.
2. Replace the mask diffuser. The diffuser is the little mesh piece where exhaled air vents out. When it clogs or tears, the mask gets loud. A replacement diffuser (opens in new tab) is cheap.
3. Consider a quieter machine. If your machine is more than 5 years old, a refurbished AirSense 10 or 11 (opens in new tab) runs several dB quieter than legacy models.

10. Hard to exhale (the "wall" feeling)

Exhaling against CPAP pressure feels like pushing back on a strong wind. This is EPR or pressure that's too aggressive for your body.

The fix:

1. Turn on EPR if it's disabled. EPR at setting 2 or 3 drops pressure during exhale and eliminates the wall feeling for most users.
2. Ask your sleep doctor about APAP mode. APAP (auto-adjusting) modes only apply the pressure you actually need, which usually runs lower than a fixed prescription. It's a prescription change, so the doctor has to sign off.
3. Lower your fixed pressure if you're on CPAP mode and not APAP. Same caveat: needs a doctor.

11. Can't fall asleep with the mask on

Related to claustrophobia but narrower: you can tolerate the mask, but the pressure makes you too aware of your breathing to relax.

The fix:

1. Enable ramp at maximum duration. Set ramp to 45 minutes. Most users fall asleep within the ramp window, which means you never consciously feel the full prescribed pressure.
2. Use the Sleep Cycle Calculator to align your bedtime with your natural 90-minute sleep cycles. Falling asleep is easier when you time it to the start of a cycle.
3. Read a book. Boring, but effective: forcing your brain to focus on narrative pulls attention away from your breathing and the mask fades into the background.

12. Pressure feels too strong overall

The prescribed pressure feels overwhelming the moment you lie down. This is usually a prescription issue, not a mask or EPR issue.

The fix:

1. Enable ramp for a slow start, as above.
2. Talk to your sleep doctor about lowering pressure. If your AHI is well controlled at a lower pressure (the CPAP Clarity dashboard will tell you), the doctor can lower the prescription and you'll feel much better.
3. Consider APAP mode. Auto-adjusting pressure almost always runs lower than a fixed prescription for the same AHI control.

What if none of these fixes work?

If you've worked through the relevant fixes above and nothing helps, the problem is almost always upstream of the mask or supplies: either your prescription is wrong, or you have a secondary condition (central apnea, UARS, nasal obstruction) that CPAP alone can't address. Book a follow-up with your sleep doctor and bring your compliance data so the conversation is grounded in numbers instead of vibes.

Try the Troubleshooter

Run the Troubleshooter for a ranked-fix list based on your specific symptom combination. It's free, your answers never leave your browser, and it takes under a minute. Pair it with the Cost Calculator if you're also trying to decide whether to change masks or switch from insurance to cash-pay supplies.

FAQs

How long should I try each fix before giving up?

Give each fix at least 3 nights. Gear changes and pressure changes both take a few nights to stabilize.

My DME supplier wants me to come in. Is that necessary?

Only if you're within the 90-day Medicare compliance window. Outside that window, most fixes can be applied at home. The DME visit is sometimes required for pressure changes because the doctor has to sign off on the new prescription.

Is it safe to adjust pressure myself?

No. Pressure changes require a new prescription for billing purposes and may mask a deeper problem (central apneas, complex sleep apnea) that needs different treatment. Always go through your sleep doctor.

Should I use a smart CPAP cleaner?

Not necessary and possibly counterproductive. ResMed and most manufacturers advise against ozone cleaners; hand washing with CPAP-safe cleaners (opens in new tab) is what the manuals recommend.