Acid reflux is the term used to refer to the fact that acid made by stomach cells is flowing backward into the esophagus. With acid reflux, you may have occasional heartburn, stomach upset and a feeling of tasting foods again as you regurgitate them.
http://bismarcktribune.com/lifestyles/health-med-fit/acid-reflux-often-controlled-with-lifestyle-changes/article_5dced996-eafa-5ba1-8675-fafb2fdd555a.html
Acid reflux often controlled with lifestyle changes