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ERGD or GERD stand for esophageal reflux gastro disease or gastro esophageal reflux disease. They're the same.
esophageal reflux
The lower sphincter is responsible for reflux problems
Acid Reflux is referred to as GERD (gastro-esophageal reflux disease) but it is most commonly known as heartburn (symptom of reflux).
Gastroesophageal reflux disease (GERD)