Acid reflux

Acid reflux refers to the reflux of gastric contents to the oropharynx through the esophagus, and acidic substances are felt in the mouth. It and the duodenal contents reflux to the oropharynx through the stomach and esophagus, and bitter substances are felt in the mouth. For reflux. Symptoms and harms caused by acid reflux may include ① heartburn; ② esophageal pain; ③ swallowing pain; ④ difficulty swallowing; ⑤ respiratory symptoms.

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