Continuous positive airway pressure, better known as CPAP, is a common and effective treatment for obstructive sleep apnea. The machine delivers pressurized air through a mask or nasal interface to help keep the airway open while you sleep.
Although CPAP can significantly improve sleep apnea symptoms, some people experience side effects, especially when they first begin treatment. Common problems include a runny nose, sneezing, nasal congestion, dry nose dry mouth, mask leaks, skin irritation and bloating.
For many people, these problems can be improved by adjusting the mask, changing humidification, addressing air leaks or working with a sleep specialist.
One particularly frustrating problem is waking up with a runny or stuffy nose and frequent sneezing after using CPAP.
Can CPAP Cause Sneezing and a Runny Nose?Yes. CPAP use can be associated with sneezing, nasal congestion and a runny nose.
Mayo Clinic lists a stuffy, runny or dry nose among common CPAP problems. Cleveland Clinic also notes congestion and a runny nose as potential CPAP side effects, often related to cold or dry airflow.
The continuous flow of air through the nose can irritate sensitive nasal tissues. If the air is too dry or cold, the nasal passages may respond by becoming irritated, producing additional mucus or becoming congested.
This can create a frustrating cycle:
CPAP airflow → nasal irritation → sneezing/runny nose → congestion → difficulty using CPAP comfortably.
Fortunately, there are several ways to troubleshoot the problem.
Why Does CPAP Make Me Sneeze?
Sneezing is a natural response when something irritates the inside of the nose. CPAP airflow may contribute to nasal irritation in some users.
Possible reasons include:
- Dry CPAP airflow
- Cold air entering the nasal passages
- Nasal inflammation
- Seasonal allergies
- Dust or other airborne allergens
- A dirty or poorly maintained CPAP system
- An improperly fitted mask
- Existing nasal congestion or a cold
It’s important to remember that CPAP may not always be the actual cause of sneezing. Allergies, viral infections and other forms of rhinitis can also cause sneezing and a runny nose.
If sneezing happens primarily when you use CPAP and improves when you are away from the machine, however, the airflow, humidity, mask or equipment may be contributing.
Why Does CPAP Cause a Runny Nose?
A runny nose, medically called rhinorrhea, can occur when the nasal passages become irritated.
CPAP machines continuously deliver air, and dry or cold air may irritate the nasal lining. This can trigger increased nasal secretions.
Sleep Foundation notes that nasal congestion and a runny nose can occur with CPAP therapy, while Mayo Clinic identifies a stuffy, runny or dry nose as a common CPAP problem.
Other causes of a runny nose should also be considered. Allergies, colds, sinus problems and environmental can irritants can all produce similar symptoms.
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Side Effects of Using CPAP Machines
Continuous positive airway pressure, commonly known as CPAP, is one of the most widely used treatments for obstructive sleep apnea. A CPAP machine delivers a steady stream of pressurized air through a mask to help keep the airway open while you sleep.
For many people, CPAP therapy can improve sleep quality and reduce symptoms associated with sleep apnea. However, getting used to a CPAP machine can take time. Some users experience temporary or ongoing side effects related to the mask, air pressure, humidity, or equipment fit.
The good news is that many common CPAP problems can be improved by adjusting the mask, changing humidificationsettings, or working with a healthcare professional to optimize the therapy.
Common CPAP Machine Side Effects
1. Dry Mouth
Dry mouth is one of the most common complaints among CPAP users. It can occur when air escapes through the mouth while using a nasal mask or nasal pillows, particularly if you naturally breathe through your mouth during sleep.
Signs of CPAP-related dry mouth may include:
- Waking up with a very dry mouth
- Thirst during the night
- Dry or cracked lips
- Sore throat
- Increased discomfort when swallowing
A heated humidifier can add moisture to the air delivered by the CPAP machine. In some cases, a different mask style, such as a full-face mask, may be more appropriate for people who consistently breathe through their mouths.
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2. Dry or Stuffy Nose
Pressurized air can cause nasal dryness, congestion, irritation, sneezing, or a runny nose. In some people, very dry nasal passages can even contribute to nosebleeds.
A heated humidifier may help reduce dryness and irritation. Saline nasal products may also provide relief for some people, although you should ask your healthcare professional about the appropriate option for your situation.
3. CPAP Mask Leaks
A mask that does not fit correctly can allow pressurized air to escape. You may hear a hissing sound or notice that air is blowing toward your eyes or face.
Mask leaks can contribute to:
- Dry eyes
- Dry mouth
- Nasal irritation
- Skin irritation
- Reduced comfort
- Difficulty maintaining effective therapy
Simply tightening the straps is not always the answer. An overly tight mask can create pressure points and actually make discomfort worse. The mask may need to be resized or replaced with a different style.
4. Skin Irritation and Pressure Marks
CPAP masks sit against the face for several hours every night. If the mask is too tight, incorrectly sized, or made from a material that irritates your skin, you may develop redness, chafing, pressure marks, or sores.
Some people can also experience dermatitis or an allergic reaction to mask materials.
Helpful steps may include finding a better-fitting mask, cleaning the mask regularly, and discussing mask liners alternative mask materials with your CPAP provide
5. Bloating, Gas and Aerophagia
Some CPAP users swallow air while sleeping. This is known as aerophagia and can result in:
- Abdominal bloating
- Burping
- Gas
- Stomach discomfort
Aerophagia can sometimes be associated with pressure settings or the way a person breathes with the mask. If these symptoms persist, speak with your sleep specialist rather than changing pressure settings yourself. Your provider may determine whether adjustments to your therapy could improve comfort
6. Claustrophobia or Feeling Confined
Some people find wearing a CPAP mask uncomfortable because it creates a feeling of being confined. This can make it difficult to fall asleep or cause users to remove the mask during the night.
One approach recommended by Mayo Clinic is to gradually become accustomed to the mask while awake. You can begin by holding the mask against your face, then wearing it for short periods before eventually using it with the machine running.
A different mask style, particularly a less-obtrusive nasal pillow system, may also be worth discussing with your healthcare provider.
7. Trouble Falling Asleep
It can take time to adjust to sleeping with a mask, tubing, and pressurized airflow.
Some people find it helpful to practice using the mask during the day while reading, watching television, or relaxing. CPAP machines equipped with a ramp feature can gradually increase pressure as you fall asleep, which may make the transition more comfortable.
If difficulty sleeping continues, talk with your healthcare team rather than simply abandoning treatment.
8. Dry Eyes or Watery Eyes
Dry or watery eyes can sometimes be a sign that air is escaping around the CPAP mask and blowing toward the eyes.
A properly fitted mask should create an effective seal without excessive pressure on the face. If you regularly wake with irritated, dry, or watery eyes, ask your CPAP provider to check your mask fit.
9. Nasal or Upper Respiratory Irritation
Some CPAP users experience coughing, nasal irritation, or other upper-airway symptoms. Proper cleaning and maintenance of the mask, tubing, and humidifier chamber are important because dust, allergens, and microorganisms can accumulate in poorly maintained equipmen
Always follow the cleaning and maintenance instructions provided by the manufacturer of your specific CPAP equipment.
Are CPAP Side Effects Dangerous?
Most common CPAP side effects are related to comfort, mask fit, dryness, or adjusting to positive airway pressure. They do not necessarily mean that CPAP therapy is harmful or that you should stop treatment.
In fact, CPAP is an important treatment for obstructive sleep apnea, and consistent treatment can provide significant health benefits.
However, persistent or severe symptoms should not be ignored.
Contact your healthcare professional if you experience ongoing discomfort, significant chest pain, severe breathing difficulty, persistent headaches, dizziness, or other concerning symptoms. Your provider can review your symptoms and CPAP data and determine whether your mask, pressure settings, or treatment approach needs to be changed.
How to Reduce CPAP Machine Side Effects
Fortunately, several simple steps can make CPAP therapy more comfortable.
Check Your Mask Fit
Your mask should fit securely without being painfully tight. A poor fit can cause air leaks, pressure marks, dry eyes, and other problems.
If your mask is uncomfortable, ask your CPAP provider about trying another size or style. There are nasal pillow, nasal, full-face, and hybrid mask designs available.
Consider Heated Humidification
A heated humidifier can add moisture to CPAP airflow and may help reduce dry mouth, dry nose, and nasal irritation.
Keep Your Equipment Clean
Regularly clean your mask, tubing, and humidifier components according to the manufacturer’s instructions. Proper maintenance helps reduce the accumulation of dust, allergens, and microorganisms.
Replace Worn Equipment
Masks, cushions, tubing, filters, and other components can become worn over time. Damaged or deteriorating equipment may contribute to air leaks and discomfort.
Follow the replacement schedule recommended for your specific equipment and insurance or healthcare program.
Don’t Change Pressure Settings on Your Own
If the pressure feels too strong or too weak, talk with your sleep specialist or CPAP provider. Your treatment settings should be adjusted based on your individual needs.
When Should You Talk to a Doctor About CPAP Side Effects?
You should consider contacting your healthcare professional if:
- Your CPAP mask continually leaks.
- You develop persistent skin sores or irritation.
- Dry mouth or nasal dryness is severe or doesn’t improve.
- You regularly experience bloating or abdominal discomfort.
- You cannot tolerate the mask.
- You continue to snore heavily while using CPAP.
- You remain excessively tired during the day.
- You experience concerning symptoms such as chest pain, dizziness, or significant breathing problems.
Your healthcare team may be able to improve your treatment by adjusting the mask, humidification, pressure settings, or type of CPAP therapy.
Frequently Asked Questions About CPAP Side Effects
What is the most common side effect of CPAP?
Common problems include dry mouth, dry or congested nose, mask leaks, skin irritation, discomfort, and difficulty adjusting to the mask. Some users also experience aerophagia, which can cause bloating and gas.
Can CPAP cause dry mouth?
Yes. Dry mouth can occur when a person breathes through their mouth while using CPAP or when air leaks around the mask. Humidification and an appropriately fitted mask may help.
Can CPAP cause bloating?
Yes. Some people swallow air while using CPAP, a condition called aerophagia. It may cause bloating, belching, gas, or abdominal discomfort. Persistent symptoms should be discussed with a healthcare professional.
Can CPAP damage your nose?
CPAP can cause nasal dryness, irritation, congestion, or nosebleeds in some users, particularly when the delivered air is dry. Proper humidification and mask fit can help reduce these problems.
Should I stop using CPAP if I have side effects?
Do not stop prescribed CPAP treatment without discussing it with your healthcare professional. Many side effects can be addressed by changing the mask, improving humidification, or adjusting the therapy under professional guidance.
CPAP therapy can take some getting used to, but experiencing side effects does not necessarily mean you have to live with discomfort. The right mask, proper fit, appropriate humidification, regular equipment maintenance, and professional follow-up can make CPAP therapy much easier to tolerate.
If you are struggling with CPAP machine side effects, talk with your doctor, sleep specialist, or CPAP equipment provider. Small adjustments can often make a significant difference in comfort and help you continue receiving the benefits of sleep apnea treatment.
Medical Disclaimer: This article is for educational purposes only and is not a substitute for personalized medical advice, diagnosis, or treatment. Always consult your healthcare professional about CPAP therapy and any symptoms or side effects you experience.
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