Achalasia happens when the processes that move food to your stomach don’t work properly. For food and liquids to pass from your mouth to your stomach, two things need to happen after you swallow.

Achalasia is a rare but serious condition that affects your esophagus, the tube that carries food from your throat to your stomach. With achalasia, your lower esophageal sphincter (LES) fails to open ...

The esophagus consists of two anatomically and physiologically distinct regions, namely a proximal striated muscle portion (cervical esophagus) and a distal smooth muscle portion (thoracic and ...