Table 1: The origin and types of dysphagia are described.

ClassificationAbnormality

Oropharyngeal dysphagia
 (i) Oral phaseDifficult prehension and/or abnormal transport of bolus to tongue base
 (ii) Pharyngeal phaseAbnormal transport of bolus from oropharynx to hypopharynx
 (iii) Cricopharyngeal phaseAbnormal transport of bolus through upper esophageal sphincter
Esophageal dysphagiaDisorder of transport of bolus through the esophagus to the stomach
Gastroesophageal dysphagiaAbnormal transport of bolus through the lower esophageal sphincter