<unk>  is a primary esophageal motility disorder of unknown etiology.In this disorder, the smooth muscle layer of the esophagus has impaired peristalsis (muscular ability to move food down the esophagus), and the lower esophageal sphincter (LES) fails to relax properly in response to swallowing due to absent enteric neurons.  It should be differentiated from pseudoachalasia (caused by neoplastic infiltration of myenteric neurons) and secondary<unk>  (caused by extrinsic procedures such as previous fundoplication and gastric banding).  Trypanosoma cruzi infection causing Chagas disease can also result in<unk> .  It is an incurable chronic condition.
Achalasia
Nutcracker esophagus
Barrett's esophagus
Diffuse esophageal spasm
Esophageal candidiasis
Esophageal stricture
Esophageal cyst
Eosinophilic esophagitis