Structural abnormalities of the gastrointestinal tract are common in EDS due to the fragility and extensibility of the tissue. Hiatal hernia, gastric, duodenal and colonic diverticula may occur. Other features which have been demonstrated are visceroptosis (protrusion of the contents of the abdomen), slow motility, delayed gastric emptying, gastric atony (lack of contraction of the stomach), recurrent abdominal pain, gastroesophageal reflux disease (GERD), megaoesophagus, irritable bowel, constipation, diarrhea, megacolon, bleeding, ruptures and perforations.
Resources: Solomon JA et al. "GI Manifestations of EDS." Am J Gastroenterol 1996 Nov; 91 (11): 2282–8. Available from http://bit.ly/UzmCCX.
Poken-Harris et al. "The Prevalence of Non-Surgical Complications in the EDS."