That's where the valve between the lower end of the esophagus and the stomach weakens and allows stomach acid to back up into the esophagus, causing heartburn. If you have chronic heartburn ...

First, heartburn. Largely considered a gastrointestinal issue, it tends to strike after people eat a lot and stomach acids back up into the ... and H2 blockers, which lower acid levels in the ...

Tis the season for heartburn. Dr. Mark Pochapin ... stomach acid stays in the stomach thanks to gravity and a valve called the lower esophageal sphincter, which tightly seals off the esophagus.