Achalasia

Achalasia is a rare disease of the muscle of the esophagus (swallowing tube) and refers to the inability of the lower esophageal sphincter (a ring of muscle situated between the lower esophagus and the stomach) to open and let food pass into the stomach. As a result, patients with achalasia have difficulty in swallowing food.
Treatments for achalasia include oral medications, stretching of the lower esophageal sphincter, surgery to cut the sphincter (esophagomyotomy), and the injection of botox into the sphincter. All four treatments reduce the pressure within the lower esophageal sphincter to allow easier passage of food from the esophagus into the stomach.

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