Achalasia

n. inability of muscles to relax (Medical)

Achalasia, also known as esophageal achalasia, achalasia cardiae, cardiospasm, dyssynergia esophagus, and esophageal aperistalsis, is an esophageal motility disorder. 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. The most common form is primary achalasia, which has no known underlying cause. However, a small proportion occurs as a secondary result of other conditions, such as esophageal cancer or (in South America) Chagas disease.
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Achalasia is a disorder of the esophagus that prevents normal swallowing. Description Achalasia affects the esophagus, the tube [more]Achalasia - Community and Resources

A failure of relaxation, especially of the muscle fibers at the junction of the esophagus and stomach.

ACALASIA