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PAP treatment is very safe and effective for treating sleep apnea, however it can take time to get used to the feeling of the mask and breathing against the positive air pressure. When adjusting to your new machine, you may experience nasal congestion, headaches, skin irritation or stomach bloating. Most of these side effects are temporary and can be reduced by changing the mask style or using a heated humidifier to add moisture to the air. See positive airway pressure (PAP) therapy tips for techniques to resolve issues. If symptoms persist, be sure to contact your physician.