CPAP Frequently Asked Questions: Expert Answers from a Licensed Respiratory Therapist

General CPAP Questions

What is CPAP?

CPAP stands for Continuous Positive Airway Pressure. It is a non-invasive therapy that delivers a steady stream of pressurized air through a mask, keeping your upper airway open while you sleep. It is the first-line, evidence-based treatment for obstructive sleep apnea (OSA).

How does CPAP work?

The pressurized air acts like a pneumatic splint, preventing the soft tissue at the back of your throat from collapsing during sleep. This eliminates the breathing interruptions (apneas) that fragment your sleep, drop your blood oxygen, and stress your cardiovascular system.

What conditions does CPAP treat?

CPAP primarily treats obstructive sleep apnea. It is also used for some cases of complex sleep apnea syndrome. For central sleep apnea or more complex respiratory conditions, a BiPAP or specialized device may be more appropriate. See BiPAP vs CPAP.

Do I need a prescription for a CPAP machine?

Yes. CPAP machines require a prescription in the United States. Your prescription is based on your sleep study results and specifies the pressure setting your therapy requires. Read Do You Need a Prescription for a CPAP Machine?

How do I get a CPAP machine?

After receiving your sleep apnea diagnosis and prescription, you can obtain a CPAP machine through a DME provider like My Respiratory Company. You can purchase directly (cash pay) or use insurance. Read our guide on CPAP cash pay vs insurance, and see how much a CPAP machine costs.

Equipment and Setup Questions

What types of CPAP masks are available?

There are three main mask categories:

• Nasal Pillows: The most minimal option. Two small cushions insert just inside the nostrils. Great for active sleepers, glasses wearers, and patients with claustrophobia.
• Nasal Masks: Cover only the nose. A popular middle-ground option with a good seal.
• Full Face Masks: Cover both nose and mouth. Essential for mouth breathers or patients prescribed higher pressures.

Mask fit is critical. A poor-fitting mask causes air leaks that reduce therapy effectiveness. Browse full face masks, nasal masks or masks and tubing, or book a CPAP Setup Education session with our licensed RRT.

Do I need a humidifier with my CPAP?

Most modern CPAP machines include a heated humidifier, and you should use it. Dry pressurized air causes nasal dryness, congestion, and throat irritation, which are among the top reasons patients abandon therapy. Set your humidifier to a comfortable level and increase as needed.

Can I travel with my CPAP machine?

Yes. Most current CPAP machines are travel-compatible. Many are dual-voltage (100 to 240V) and allowed for in-cabin airline use. Check your machine's documentation, and notify your airline in advance when traveling with medical equipment.

How often should I clean my CPAP equipment?

• Daily: Rinse your mask cushion and humidifier water chamber with warm water
• Weekly: Wash the full mask assembly, tubing, and headgear with mild soap and water; allow to air dry completely
• Monthly: Inspect and replace disposable filters
• Every 1 to 3 months: Replace mask cushions and nasal pillows
• Every 6 to 12 months: Replace the full mask, tubing, and humidifier chamber

Never use ozone-based cleaners. They degrade mask materials and damage the machine. Full steps: how to clean your CPAP machine properly.

Therapy and Compliance Questions

Can I adjust the CPAP settings myself?

You should not adjust your prescribed pressure setting without guidance from your prescribing physician or a licensed respiratory therapist. An incorrect pressure can either fail to treat your apneas or cause new problems.

What are the most common side effects of CPAP therapy?

• Dry mouth or nose: Increase humidifier settings or switch to a full-face mask if mouth breathing is occurring
• Mask discomfort: Usually a fit issue; try a different mask style or size
• Aerophagia (swallowing air): Can cause bloating; may indicate pressure is too high, so discuss with your provider
• Claustrophobia: Start with nasal pillows and practice wearing the mask while awake

More fixes: most common CPAP problems and solutions and why is my CPAP so loud.

How long does it take for CPAP therapy to work?

Many patients notice improved energy and reduced daytime sleepiness within the first week of consistent use. Blood pressure improvements and deeper cognitive benefits typically develop over the first 1 to 3 months of regular therapy. Consistency is essential.

What if my AHI is still high on CPAP therapy?

Your machine tracks residual events. If your AHI on therapy remains above 5, your pressure may need to be adjusted. This is why therapy data monitoring matters. Learn to read your numbers in How to Read Your Sleep Apnea Test Results.

Can I stop using CPAP?

Not safely on your own. CPAP cannot be tapered like a ventilator. You can stop only if a repeat sleep study, ordered by your doctor, shows your sleep apnea is gone or controlled by another treatment such as significant weight loss. Read the full guide: How to Wean Off CPAP: Can You Safely Stop Using It?

Still Have Questions?

At My Respiratory Company, you can book a consultation with our licensed Registered Respiratory Therapist. Bring your sleep study results, your current machine data, or just your questions, and get real clinical answers. Call 706-772-0263.

Ready to find a device? Browse our CPAP and APAP machines. Or keep learning with our guides on sleep apnea and types of PAP devices.