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.
Dysphagia can be caused by a difficulty anywhere in the swallowing process described above. There are two general types of dysphagia: Oropharyngeal dysphagia (high dysphagia) - the problem is in the mouth and/or throat, sometimes caused by tongue weakness after a stroke, or due to a difficulty making saliva.