1. The wrong size or style CPAP mask

Work closely with your healthcare professional and the CPAP supplier to make sure you have a CPAP mask that fits properly. People have different face shapes, so the right mask style and size for someone else may not work for you.

• Try a different mask. A range of CPAP masks is available. For example, a full face mask covers the mouth and nose, with straps that stretch across the forehead and cheeks. These may make some people feel claustrophobic, but they work well for those who prefer to breathe through their mouths during sleep. They also provide a stable fit for people who move around a lot during sleep.

  Other masks feature nasal pillows that fit under your nose and straps that cover less of your face. These can feel less cumbersome.

  Nasal pillows may work well if you wear glasses or read with the mask on because some don't block the eyes as much as full face masks do. However, this mask style may not be an option if you move around a lot during sleep or have difficulty breathing through your nose, such as due to congestion.

• Pay attention to size. Most masks come in different sizes. Just because you're a certain size in one mask doesn't mean you'll be the same size in another. CPAP masks are usually adjustable.

  Ask your healthcare professional or CPAP supplier to show you how to adjust your mask to get the best fit. Manufacturer product instructions also can help show you how to do this. A properly fitting mask shouldn't be uncomfortable or cause pain.