The lower esophageal sphincter (LES) serves as a vital barrier between the stomach and esophagus, preventing the backflow of ...

Weiser, M. R. et al.Sphincter preservation in low rectal cancer is facilitated by preoperative chemoradiation and intersphincteric dissection. Ann. Surg. 249, 236–242 (2009). Article Google Scholar ...

The esophagus enters the right side of the stomach, so sleeping on the left side keeps acid away from the lower esophageal sphincter. The sphincter is normally responsible for keeping acid and ...