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WebMD:Gastroesophageal Reflux Disease (GERD)
Gastroesophageal reflux disease, or GERD, is a digestive disorder that affects the lower esophageal sphincter (LES), the ring of muscle between the esophagus and stomach. Many people, including pregnant women, suffer from heartburn or acid indigestion caused by GERD.
https://www.webmd.com/heartburn-gerd/guide/reflux-disease-gerd-1
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GERD | Gastroesophageal Reflux Disease | MedlinePlus
If you have painful burning in your throat, you may have GERD (Gastroesophageal Reflux Disease). Identify symptoms and learn how to treat it.
https://medlineplus.gov/gerd.html
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International Foundation for Gastrointestinal Disorders: About GERD
Gastroesophageal reflux disease, or GERD, is a very common disorder. Gastroesophageal refers to the stomach and the esophagus. Reflux refers to the back-flow of acidic or non-acidic stomach contents into the esophagus.
https://www.aboutgerd.org/signs-and-symptoms-overview.html
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WebMD: What is Acid Reflux?
At the entrance to your stomach is a valve, which is a ring of muscle called the lower esophageal sphincter (LES). Normally, the LES closes as soon as food passes through it. If the LES doesn't close all the way or if it opens too often, acid produced by your stomach can move up
https://www.webmd.com/heartburn-gerd/guide/what-is-acid-reflux-disease
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Healthline: GERD (Acid Reflux): Symptoms, Causes, Treatment, Diet & More
Acid reflux disease or GERD is a chronic digestive disease with symptoms of esophageal burning and heartburn. These uncomfortable symptoms can be troublesome and interfere with your daily activities. Learn how to tell if you have GERD, what causes it, and what treatment options are available.
https://www.healthline.com/health/gerd
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Mayo Clinic: Acid reflux and GERD - The same thing?
Acid reflux and GERD are closely related, but the terms aren't necessarily interchangeable.
https://www.mayoclinic.org/diseases-conditions/heartburn/expert-answers/heartburn-gerd/faq-20057894
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Gastroesophageal reflux disease (GERD) - Symptoms and causes - Mayo Clinic
GERD, in which stomach acid moves into the esophagus, causes discomfort and may lead to precancerous changes in the lining of the esophagus.
https://www.mayoclinic.org/diseases-conditions/gerd/symptoms-causes/syc-20361940
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GERD (Chronic Acid Reflux) | Cleveland Clinic
In GERD (chronic acid reflux) stomach acid flows back up into the mouth. Discover relief from heartburn, indigestion, trouble swallowing and other GERD symptoms.
https://my.clevelandclinic.org/health/diseases/17019-gerd-or-acid-reflux-or-heartburn-overview