Comfort and side effects

Hard to Breathe Out on CPAP? Exhale Relief and Other Fixes

Difficulty breathing out against CPAP air is common in the first weeks. Exhale relief (EPR or Flex), the ramp and practice usually help, and if not, your clinician can consider auto CPAP or a bilevel machine.

Signs

  • Feeling you must push to breathe out
  • Chest or breathing muscles feel tired
  • Waking up short of breath
  • Taking the mask off to exhale

Common causes

Steady pressure on exhale
Standard CPAP keeps one pressure while you breathe in and out, so breathing out against it can feel like work.
Pressure may be higher than needed
The Sleep Foundation lists discomfort breathing out as a sign pressure may be too high. Your clinician decides that.
Exhale relief turned off
EPR on ResMed and Flex on Philips machines lower pressure as you breathe out. If off, exhaling is harder.

Fixes to try, easiest first

  1. Practice breathing with the mask awake

    Wear your mask with the air on for 10 to 20 minutes while reading or watching TV. Breathe slowly through your nose and let the out breath be passive.

  2. Use the ramp

    Starting at lower pressure while you fall asleep can make the first part of the night easier.

  3. Turn on exhale relief

    ResMed's EPR lowers pressure by 1 to 3 cm H2O on exhale, and pressure stays at 4 cm H2O or more. F&P notes pressure relief is a feature that lowers pressure on exhalation. Ask your provider how to access it on your machine if it is not on your patient menu.

  4. Fix leaks

    A leaking mask can make an auto machine raise pressure. Refit your mask lying down with the air on.

  5. Ask about APAP or BiPAP with your clinician

    The Sleep Foundation suggests asking about an auto adjusting machine or a BiPAP if exhaling is difficult. MedlinePlus explains BiPAP uses higher pressure when you breathe in and lower pressure when you breathe out.

When to call your doctor

Call your clinician if breathing out stays hard after a week or two, or if you wake short of breath. Get emergency help by calling 911 for chest pain, severe shortness of breath, or symptoms that do not ease when you take the mask off.

Mask types this applies to

Nasal maskNasal pillows maskFull face mask

Frequently asked questions

Is it normal to struggle to exhale on CPAP?

It is common in the first weeks. Exhale relief, ramp and daytime practice help most people get used to it.

What is the difference between EPR and BiPAP?

EPR is a comfort feature on CPAP that drops pressure by up to 3 cm H2O on exhale. BiPAP is a different machine with two separate prescribed pressures for breathing in and out, set by your clinician.

Will a full face mask make exhaling easier?

Not usually. The mask type does not change the pressure. Exhale relief and a review of your settings are more likely to help.

Sources

Last reviewed October 11, 2026. How we research · Report an error

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