Thank you for your question

For your information, gastritis is referring to inflammation that occur on gastric lining. In long run, gastritis progress into ulcer formation in this will cause pain.

On the other hand, GERD is a short form for Gastro-Esophageal Reflux Disease. This condition occurs due to the weakening of the lower esophageal spincter. This conditions will cause someone to regurgitate stomach content including stomach acid. When this occur, patient will experience soury taste on the mouth.

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