In a definition essay, you explain the meaning of a certain term by giving a detailed description of it, and support your definition with clear examples or facts. Such explanations are needed if a term is special, abstract, disputed or does not have a common meaning.
Dysphagia may be caused by traumatic injuries to the head, neck, or chest and result from accidents or iatrogenic causes. In the latter category, both planned and inadvertent injuries to cranial nerves are common. Many accident victims have involvement of multiple sites.
Functional dysphagia. Achalasia of the lower esophageal sphincter: it is a lack of relaxation of the lower esophageal sphincter causing dilation of the esophagus upstream (which accumulate food that can not enter the stomach) hence the term âmega-esophagus.â Its cause is unknown.