Backgrounds & Aims: The incidence of diabetes type І and Π is increasing in all over the world. Gastrointestinal symptoms are the most common complaints of these patients. This study was done to find the frequency of GI symptoms and determine their relationship with diabetic complications and blood glucose controlling in diabetic patients.

  Materials & methods: These studies were done prospectively on 638 in and out patients with diabetes mellitus. They were evaluated with a validated questionnaire, then HBA1c was checked in their blood. These cases were 214 males and 424 females. Eighty-one of cases were type І of DM and 557 of cases were type П (of DM). Frequency of diarrhea, constipation, fecal incontinence, episodic abdominal pain in well-controlled diabetics were 4%, 4.9%, 0%, 2.9% respectively ^' but in uncontrolled diabetics they were 41.9% (OR=1.47), 51.4% (OR=0), 10% (OR=1.03), 51.42% (OR=1.10)

  Conclusion: In this study increasing of glucose levels resulted in increasing the number of lower gastrointestinal symptoms