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Achalasia is an oesophageal smooth muscle motility disorder:

  • failure of relaxation at the lower oesophageal sphincter
  • progressive dilatation, tortuosity, incoordination of peristalsis and hypertrophy of the oesophagus
  • functional obstruction at the lower end of the oesophagus.

Achalasia may occur at any age but particularly in the second to fifth decade of life with peak incidence between ages 30 to 60 years. Males and females are affected equally (1,2).

Annual incidence is about 1 per 100,000 and prevalence of 10 per 100,000 (1).


Last edited 02/2022 and last reviewed 02/2022