Narrowing of the anastomosis is another gastric bypass surgery complication.

First, it is important to understand what the word "anastomosis" means. According to the Wikipedia definition surgical anastomosis "is to join together two hollow organs (viscus), usually to restore continuity after resection, or to bypass an unresectable disease process." As part of gastric bypass surgery, this sort of surgical procedure must be done to the intestines.

Unfortunately, sometimes the anastomosis (or where the intestines have been rejoined together) narrows, and this can cause complications of gastric bypass surgery. This particular complication is somewhat frequent in gastric bypass surgery patients. It results in sever vomiting.

A common treatment of this complication is the insertion of an endoscopic balloon to help open the area. Most patients respond favorably to this simple procedure.