. . . "Conditions that may cause swallowing problems include nervous system disorders, such as Parkinson???s disease or cerebral palsy; esophageal problems, such as Heartburn, Gastroesophageal Reflux (GER) and Gastroesophageal Reflux Disease (GERD); stroke; head or spinal cord injury; or cancers of the head, neck or esophagus." .