Coughing can be caused by irritation in the airway. Ensure that your humidity is set appropriately. If the air is too dry this could be causing your nasal/oral airways or lungs to become irritated which can result in coughing. Also ensure that you are properly cleaning and replacing your PAP equipment. Bacteria and molds can also cause respiratory infections that can cause coughing. Please contact our office for new supplies if your equipment is more than 6 months old.