Achalasia

Injury	Disease	Nutrition	Poison

Symptoms	Surgery	Test	Special Topic

Digestive system

Upper gastrointestinal system

Achalasia

Definition:

Achalasia is a disorder of the esophagus (the tube that carries food from the mouth to the stomach). The esophagus is less able to move food toward the stomach, and the valve from the esophagus to the stomach does not relax as much as it needs to during swallowing. This relaxation is needed to allow food to enter the stomach.

Alternative Names:
Esophageal achalasia
Causes, incidence, and risk factors:

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The main abnormality in achalasia is a failure of the lower esophageal sphincter (a muscular ring at the junction of the esophagus and stomach) to relax during swallowing. The disorder is characterized by loss of the wave-like contraction of smooth muscles that forces food through the digestive tract. (These contractions are called peristalsis.)

Another part of the disorder is lack of nervous stimulation to the esophagus. Causes include damage to the nerves to the esophagus, parasitic infection, cancers, and hereditary factors. Achalasia is a rare disorder, may occur at any age, but is most common in middle-aged or older adults.