CPAP Therapy Side Effects & How to Prevent Them

CPAP therapy is one of the most effective treatments for sleep apnea, but like adjusting to any new nightly habit, it can come with a few bumps along the way. Dry mouth, mild bloating, a stuffy nose, or a mask that feels uncomfortable at first are all common in the early weeks of therapy — and the good news is that almost all of them are temporary, and usually easy to resolve once you know what's actually causing them.

This guide walks through the most common CPAP side effects, why they happen, and practical ways to prevent or fix each one — so a rough first few weeks doesn't turn into giving up on treatment altogether.

Common CPAP Side Effects at a Glance

• Dry mouth, nose, or eyes
• Bloating or gas (aerophagia)
• Skin irritation or pressure marks
• Sore teeth, gums, or jaw
• Sinus congestion or ear pressure
• Coughing or throat irritation
• Chest discomfort or shortness of breath
• Claustrophobia or anxiety around the mask
• Difficulty falling or staying asleep
• A noisy machine or mask

Airway and Breathing-Related Side Effects

Bloating and Gas (Aerophagia)

This happens when pressurised air ends up in your stomach instead of your lungs — usually from breathing through your mouth with a nasal mask, or from pressure settings that are higher than you need. To prevent it: try a chinstrap if you use a nasal mask, ask about enabling expiratory pressure relief, or consider switching to a nasal pillow mask, which reduces the chance of swallowing air. If it persists, speak with your doctor about adjusting your pressure — an auto-adjusting APAP machine can sometimes help by avoiding unnecessarily high settings.

Chest Discomfort

Mild chest tightness is fairly common when starting therapy, particularly at higher pressures, and usually eases as your body adjusts. Enabling exhalation pressure relief, using ramp mode to ease into your target pressure gradually, and increasing humidification can all help. If chest pain comes on suddenly, feels severe, or you have any heart-related risk factors, stop and speak with your doctor rather than assuming it's just an adjustment issue.

Shortness of Breath

Often described as feeling like you're "fighting" the machine to breathe out — this is usually discomfort exhaling against pressure, not an actual lack of air. Exhalation relief features, ramp mode, and giving yourself time to adjust generally resolve this. An APAP machine, which adjusts pressure automatically throughout the night, can also help avoid unnecessarily high settings that make exhaling feel harder.

Nose, Mouth, and Sinus-Related Side Effects

Dry Mouth

Usually caused by mouth breathing or airflow that isn't sufficiently humidified. A heated humidifier, a chinstrap (if you use a nasal mask), or switching to a full-face mask that covers both nose and mouth can all help. Staying hydrated during the day also makes a noticeable difference.

Dry Nose

Cold, low-humidity airflow can dry out and irritate your nasal passages, sometimes leading to nosebleeds if left unaddressed. Increasing your humidifier setting, using heated tubing if your machine supports it, and a saline nasal spray before bed are the most effective fixes.

Sinus Congestion and Irritation

Direct, dry airflow — especially from nasal pillow masks — can irritate sinus tissue over time. Adding humidification, trying a saline rinse before bed, and switching to a mask that delivers airflow more gently (like a full-face or standard nasal mask) can help reduce this.

Ear Pressure

A popping or full feeling in the ears is less common, but can happen when airflow reaches the Eustachian tubes via the sinuses, especially if you already have some congestion. Treating any underlying congestion, using ramp mode to ease into pressure gradually, and discussing your pressure settings with your doctor can help.

Coughing

Usually caused by dry air, air leaks, or a dirty filter irritating the throat and airway. Regular equipment cleaning, replacing your filter on schedule, increasing humidification, and addressing mask leaks are the most effective fixes.

Dry Eyes

If air is leaking near the bridge of your nose, it can blow directly into your eyes and dry them out. A better-fitting, low-profile mask, checking your seal, and keeping artificial tears by your bed for the mornings can help while you sort out the fit.

Comfort, Skin, and Sleep-Related Side Effects

Skin Irritation

Redness, pressure marks, or breakouts are usually down to a mask that's overtightened, dirty, or simply not the right material for your skin. Clean your mask daily, avoid overtightening the headgear, and consider a different cushion material if you're sensitive to silicone.

Sore Teeth, Gums, or Jaw

This is more likely if you already have a history of jaw tension (TMJ), or if a full-face mask is pressing on your upper gums. A better-fitting mask, loosening the headgear slightly, and addressing any dry-mouth-related nighttime clenching can ease this.

Claustrophobia and Anxiety

Feeling overwhelmed by the mask, especially early on, is a very common reaction. Practising wearing the mask while awake — reading or watching TV, for instance — helps your body get used to the sensation before it's tied to falling asleep. A smaller, low-profile mask style and easing into full-night use gradually (rather than all at once) can also help considerably.

Difficulty Falling or Staying Asleep

New sensations — the mask, the airflow, the noise — can genuinely make falling asleep harder in the first weeks. Ramp mode, a consistent bedtime routine, and simply giving yourself time rather than expecting an instant adjustment all help. This one, more than most, tends to resolve itself as your body adapts.

A Noisy Machine or Mask

Whistling usually points to a mask leak; gurgling is often condensation (rainout) in the tubing; a general hum can be loose connections or ageing parts. Checking your seal, using heated tubing to reduce condensation, and replacing worn parts on schedule usually solves this.

Headaches

CPAP therapy usually reduces morning headaches over time — but if you're still getting them, an overtightened mask, sinus congestion, or pressure settings that feel too high are the most common culprits. Loosening your headgear slightly, adding humidification, and speaking to your doctor about your pressure settings are the first things to try.

Rare Long-Term Side Effects

Most people use CPAP therapy for years without any lasting issues. In rare cases, long-term use has been associated with mild voice changes (from constant airflow over the vocal cords) or, occasionally, the emergence of central sleep apnea in someone being treated for the obstructive type — sometimes called treatment-emergent central sleep apnea. Both are worth flagging to your doctor if you notice them, though neither is common.

Why It's Worth Solving These Issues Rather Than Stopping Therapy

It's tempting to give up on CPAP therapy when side effects make the first few weeks uncomfortable — but stopping means going back to untreated sleep apnea, which carries real long-term risks to your heart, blood pressure, and overall health. The side effects covered here are almost always fixable with a small adjustment: a different mask, a bit more humidity, or a pressure tweak. It's worth pushing through the adjustment period with the right support, rather than abandoning treatment altogether.

Getting the Right Support in the UAE

If you're struggling with any of these side effects, our team at CPAP Medical Trading in Business Bay, Dubai can help you figure out whether the fix is a mask change, a settings adjustment, or an accessory like a humidifier or chinstrap. You're welcome to book a free consultation if you'd like guidance, or visit our showroom to try mask options in person. You can also reach us through our contact page or WhatsApp.

— The CPAP Med Trade Team