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What causes acid reflux disease?

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One common cause of acid reflux disease is a stomach abnormality called a hiatal hernia. This occurs when the upper part of the stomach and lower esophageal sphincter (LES) move above the diaphragm, a muscle that separates your stomach from your chest. Normally, the diaphragm helps keep acid in our stomach, but if you have a hiatal hernia, acid can move up into your esophagus and cause symptoms of acid reflux disease.

From: What Is Acid Reflux Disease? WebMD Medical Reference

SOURCES: 

National Digestive Diseases Information Clearinghouse (NDDIC): "Heartburn, Gastroesophageal Reflux (GER), and Gastroesophageal Reflux Disease."

Cleveland Clinic: "GERD or Acid Reflux or Heartburn." 

The American College of Gastroenterology: "Heartburn or Gastroesophageal Reflux Disease."

University of Maryland Medical Center: "Gastroesophageal reflux disease and heartburn."

American Academy of Family Physicians: "Heartburn: Hints on Dealing With the Discomfort."

FDA: "LINX Reflux Management System."

Reviewed by Jaydeep Bhat on February 14, 2019

SOURCES: 

National Digestive Diseases Information Clearinghouse (NDDIC): "Heartburn, Gastroesophageal Reflux (GER), and Gastroesophageal Reflux Disease."

Cleveland Clinic: "GERD or Acid Reflux or Heartburn." 

The American College of Gastroenterology: "Heartburn or Gastroesophageal Reflux Disease."

University of Maryland Medical Center: "Gastroesophageal reflux disease and heartburn."

American Academy of Family Physicians: "Heartburn: Hints on Dealing With the Discomfort."

FDA: "LINX Reflux Management System."

Reviewed by Jaydeep Bhat on February 14, 2019

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What are some other common risk factors for acid reflux disease?

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