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A hiatal hernia or failure of the lower esophageal (cardiac) sphincter to close causes the stomach contents to back up into the esophagus. This causes the esophageal wall to have a burning sensation (heartburn) and, in serious cases, bleeding. What causes the burning sensation and bleeding to occur

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Vimal1

Answer:

The hydrochloric acid produced by the stomach for digestion.

Explanation:

Due to the hernia, there is poor sphincter control thus allowing backflow of the acid into the eaophagus

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