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Different types of muscle contractions
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Smooth muscles in the wall of an esophagus move food downward with a squeezing action. These waves of muscle contractions move food through the entire digestive tract. This process is called peristalsis.
It is an abnormal contraction of the esophagus, like a muscle spasm, but in your esophagus. Your esophagus contracts by muscle contractions, so this may be a cause
Peristalsis
The rhythmic contractions of smooth muscle down an esophagus is called peristalsis. The muscle contractions that help move the food down through the esophagus (and through much of the gastrointestinal tract) are called peristalticcontractions.Interestingly, even if you are hanging upside down in a gravitational field (such as a kid hanging by his legs from the monkey bars), you can still swallow food and it will go to your stomach due to these contractions.
After passing through the pharynx, the food enters the esophagus, a muscular tube that connects the pharynx to the stomach. muscle contractions push the food through the esophagus and toward the stomach.
By peristalsis movement .peristalsis
The peristaltic movements are muscle contractions and its function on the esophagus is to push food down into the stomach and prevent it from going back into the esophagus.
Tertiary contractions of the esophagus are disorganized non-propulsive contractions of the smooth muscle of the esophageal wall. They are frequently seen during fluoroscopic evaluation in the course of a barium meal, specially in older patients.
peristalsis.... the reason why food travels through the esophagus into the stomach is that it is moved along by contractions of smooth muscle surrounding the esophagus. This is known as peristalsis