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

Classification Abnormality Oropharyngeal dysphagia    (i) Oral phase Difficult prehension and/or abnormal transport of bolus to tongue base  (ii) Pharyngeal phase Abnormal transport of bolus from oropharynx to hypopharynx  (iii) Cricopharyngeal phase Abnormal transport of bolus through upper esophageal sphincter Esophageal dysphagia Disorder of transport of bolus through the esophagus to the stomach Gastroesophageal dysphagia Abnormal transport of bolus through the lower esophageal sphincter