There are many causes. At times our valve musle that prevent fluid from going upwards aren't working well. We have one at the very end of our esophagus at the entrance to our stomach.

Meds to coat the stomach like pepto bismuth covers the inside lining of your stomach preventing the acid from damaging the underlayer. H pylori which we all have in our guts also burrows itself causing holes and pathways for acid meant to digest food however it

please DO NOT quote ANY SELECTION of my post. thank you. have a good day.