It does seem that the causes of obstructions do vary some. It does sound like corn could be causing an obstruction in your case, as others seem to experience obstructions from vegetables as well. When I had my last surgery for an obstruction in December (had 3 surgeries already, and get obstructions almost monthly), the docs suspected it was because of undigested fruit or vegetables-they said that is the most common cause. In my case though, meat is the only correlating item in my diet that I know causes obstructions. If I eat a lot of meat, I am sure to get an obstruction. Not fun, so I limit what I eat. Vegetables, on the other hand, pass right through me---quite literally. Of course, if I didn't chew adequately, I could see where they would cause an obstruction as well. I guess my only suggestion, chew well, and watch closely to see if corn causes the same problem all the time. Also, is there any food you ate with the corn that is the same as the last couple times? Sometimes someone may pay attention to one food without paying attention to what else they are eating. For me, baked potatoes will sometimes cause problems as well...as does anything else I eat. Heck, even soup plugs me up!!! Sounds crazy, but, the broth goes right through me (within minutes), then I often get obstructed after.