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>What's achalasia? Can I dive if I have it?
>A disorder of the esophageal smooth muscle, achalasia has two components: the lower esophageal sphincter that does not relax with swallowing and abnormal contractions that replace the normal movement of the esophagus.
>Food and secretions can collect in a pool in the lower esophagus and cause regurgitation when the diver is in the head-down position. As with reflux, diving is not recommended.