Acid Reflux which is also known as GERD is not a life threatening condition itself and by itself Acid Reflux cannot and will not kill you.
However left untreated the acid reflux disease or GERD can sometimes lead to other serious complications that may lead to death but that's rare.
Left untreated the acid reflux can sometimes damage your lungs.
Acid Reflux disease can in rare cases cause damage to your lungs.
The acid that passes through your lungs during Acid Reflux disease can erode and eat at your lungs which can then make it difficult to breathe.
Acid Reflux can sometimes lead to damage to the throat lining, airways, and lungs if the Acid Reflux disease is not treated.
As long as you get treated for the Acid Reflux disease then the acid with Acid Reflux Disease will not usually cause any lung damage.
My mother has Acid Reflux disease and so far she has had no lung damage or other throat lining or airway damage.
But her doctor did tell her that it is a possibility especially if she stopped taking her Acid Reflux medicine.