An upper gastrointestinal endoscopy involves inserting a flexible, lighted tube called an endoscope down your throat and into your esophagus. A tiny camera on the end of the endoscope lets your doctor examine your esophagus, stomach, and the beginning of your small intestine called the duodenum. Acid reflux causes heartburn, a burning sensation that happens when some of the acid content of the stomach flows up into the esophagus. Frequent acid reflux may be a sign of GERD. Although people may use the terms interchangeably, heartburn is a symptom of acid reflux, also known trusted Source as gastroesophageal reflux (GER). Despite the name, heartburn has nothing to do with the heart. Gastroesophageal reflux disease (GERD) is a more serious form of GER. Doctors will diagnose GERD when acid reflux becomes a recurrent complaint about an individual, usually more than twice a weekTrusted Source for several weeks at a time.
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