What do you think is likely to happen if the sphincter at the base of the esophagus does not function properly?

When the lower esophageal sphincter is atrophied, a disease called achalasia occurs, in which there is no relaxation of the esophagus when the food is swallowed,  it is difficult for the food to go down to the stomach. Some symptoms are that the food, once swallowed, can not pass and gets stuck.

Regurgitation, chest pain and weight reduction may also occur.