Achalasia: Adiseaseof theesophagusthat mainly affects young adults.Abnormalnerv的函数es and muscles of the esophagus causes difficulty swallowing and sometimes chest pain.Regurgitationof undigestedfoodcan occur, as can coughing or breathing problems related to entry of food material into thelungs. The underlying problems are weakness of the lower portion of the esophagus and failure of the loweresophagealsphincter to open and allow passage of food.Diagnosisis made by anX-ray, endoscopy, or esophageal manometry.
