Premise: Achalasia (Latin; a=absence, chalus=relaxation) is a disease of unknown cause, where the nerves at the lower end of the oesophagus degenerate. As a result the lower oesophageal sphincter (LOS) fails to relax properly during eating and remains closed. Achalasia is uncommon, and has a prevalence of 10 cases per 100,000 population
Statement: Achalasia is rare, and has a prevalence of 10 cases per 100,000 population
Relationship: neutral