An obstruction, esophageal stricture, GERD, motility disorders, or hiatal hernia are all possible.
The endoscopy would evaluate for most of these considerations. You can also consider a 24-hr pH study along with esophageal motility studies, which can evaluate for continuing GERD as well as motility disorders.
Another consideration would be delayed gastric emptying, which can be evaluated with a gastric emptying scan.
These options can be discussed with your GI physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com