Acid reflux, also known as heartburn, is the result of the lower esophageal sphincter either not closing at all or closing inadequately and allowing the acid produced by the stomach to go up into the esophagus. Common causes of acid reflux include: the presence of a hiatal hernia, being overweight, and having unhealthy eating habits. The common symptoms experienced during acid reflux include: a sensation of bloating, burping, nausea, and dysphagia or narrowing of the esophagus.
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