Gastroenterology Forms Dr. Chalifoux is board certified in Gastroenterology and Internal Medicine.  Her special interests include colon cancer screening, treatment of gastroesophageal reflux disease, and treatment for irritable bowel syndrome and inflammatory bowel disease. Her specialties include: Colonoscopy Upper endoscopy GERD/Reflux Disease Irritable bowel syndrome Inflammatory bowel disease Constipation and diarrhea