Achalasia is a health condition that prevents the nerves that control the muscles of the oesophagus and the sphincter from working properly. Normally, food is pushed down the oesophagus by a series of muscle contractions. It enters the stomach through a valve called the lower oesophageal sphincter.
When someone has achalasia, their sphincter does not relax and so food can’t pass through. Instead of passing into the stomach, the food can get stuck in the oesophagus or come back up into the mouth. (Health Direct)
Although rare, Achalasia like symptoms may affect patients after Laryngectomy surgery. The cause is unknown, but may be owing to the disruption of the nerves during surgery.