<unk>  is a narrowing of the esophagus (the tube from the mouth to the stomach). It causes swallowing difficulties, weight loss, regurgitation of food.
Esophageal stricture
Nutcracker esophagus
Esophageal web
Esophageal cyst
Achalasia
Esophageal candidiasis
Esophageal varices
Diffuse esophageal spasm