Achalasia is a rare disease of the muscle of the lower esophageal body and the lower esophageal sphincter that prevents relaxation of the sphincter and an absence of contractions, or peristalsis, of the esophagus.
The cause of achalasia is unknown; however, there is degeneration of the esophageal muscles and, more importantly, the nerves that control the muscles.
Achalasia usually manifests itself with difficulty swallowing, chest pain, regurgitation or throwing up, Luckily multiple treatment options are available for this disorder.