achalasia of the esophagus. expansion of the esophagus. hernia. infographics. on background

achalasia acid anatomy animal body diaphragm digestive disease drawing endotracheal engraving esophageal esophagus expansion fundus gastric gastroenterology gastroesophageal heartburn hernia herniation illness illustration indigestion intervention junction larynx medical organ paraesophageal pylorus reflux rings science sliding sphincter stomach swallowing system throat trachea tracheal tube type valve vector