As many of you may know, acid reflux or heartburn is that uncomfortable feeling that something you ate is coming back up. It can feel like a burning sensation — or even pain — behind the sternum. It happens when the contents in your stomach flow upward into the esophagus because the valve between the two organs doesn’t close properly.
http://www.norwalkreflector.com/Health-Care/2017/10/07/Hard-to-Swallow-Facts-about-GERD-and-esophageal-cancer
Hard to swallow: Facts about GERD and esophageal cancer