It has a name — aerophagia — and it is common enough that every clinic has heard "CPAP belly". The air the machine delivers is meant for the airway; some of it goes down the oesophagus instead, and by morning it is in the stomach. It is uncomfortable, it is not dangerous in itself, and it is very often fixable — but almost always by the clinician or DME, not by the person in the bed.
What tends to make it worse: pressure sitting at the top of its range for long stretches, mouth breathing (an open mouth is a second route for air), sleeping flat on the back, a large late meal, and simply being new — the swallowing reflex settles for many people within a few weeks.
What the data can show you — and this is the useful part. Line up the nights you woke bloated against the overnight pressure trace and the leak line. If the bad mornings are the nights the pressure spent most of its time at the upper end, or the nights with long mouth-leak stretches, you have something concrete to bring to your clinician instead of "my stomach hurts". That is exactly the conversation that leads to a changed setting, a different mask type, or a comfort feature being switched on. CPAP Aerophagia: Why Your Stomach Bloats and How to Address It · Is Your CPAP Pressure Too High or Too Low? Signs and the Data
What people try, in rough order of how often it helps: a conversation with the clinician about the pressure range and comfort features (we do not suggest values here, ever); a mask or chin-strap change if mouth leak is in the picture; sleeping on the side or with the head of the bed raised; eating earlier; and patience in the first month. Antacids treat the symptom, not the air.
If it is sudden, severe, or comes with pain rather than bloating, that is a doctor visit, not a forum thread.
Nothing on SomniTalk is medical advice. Talk to your own clinician before changing therapy.
