https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3525982/#:~:text=Patients%20were%20asked%20if%20they,or%20an%20increase%20in%20diarrhea. I also had this problem My husband developed diarrhea within 4 days of starting CPAP. It has been going for about a month now. Seems to have a lot of air. His sleep d...