Irritable Bowel Syndrome

Irritable bowel syndome (IBS) affects the large intestine and causes abdominal cramping, bloating and a change in bowel habits.

Programs + Services


Clinical Nutrition

The Division of Clinical Nutrition at Tufts Medical Center provides inpatient and outpatient nutritional services.
More information about programs and services


Gastroenterology Program

Tufts MC’s department of gastroenterology and hepatology is highly experienced in diagnosing and treating a wide range of gastrointestinal and liver conditions.
More information about programs and services

Doctors + Care Team

Edward Saltzman, MD

Edward Saltzman, MD

Title(s): Chief, Division of Clinical Nutrition; Director, Adult Nutrition Support Services; Associate Professor, Tufts University School of Medicine; Dean for Education, Friedman School of Nutrition Science and Policy, Tufts University
Department(s): Medicine, Clinical Nutrition
Appt. Phone:
Fax #:

Enteral and parenteral nutrition

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Harmony Allison, MD

Harmony Allison, MD

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Virtual Appointments Available

Online Scheduling Available

Title(s): Gastroenterologist; Assistant Professor, Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Gastrointestinal motility, inflammatory bowel disease, general GI and endoscopy, diarrhea, constipation, celiac disease and limited liver function test abnormalities

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picture of Andrew S. Greenberg, MD

Andrew S. Greenberg, MD

Title(s): Endocrinologist; Dr. Robert and Veronica Atkins Professor in Metabolism and Nutrition, Tufts University School of Medicine
Department(s): Medicine, Clinical Nutrition, Endocrinology, Diabetes and Metabolism
Appt. Phone:
Fax #:

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Joel B. Mason, MD

Joel B. Mason, MD

Accepting New Patients

Virtual Appointments Available

Title(s): Gastroenterologist; Professor, Tufts University Schools of Medicine and Friedman School of Nutritional Science and Policy; Senior Scientist and Director, Vitamins and Carcinogenesis Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University
Department(s): Medicine, Clinical Nutrition, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Malabsorption and unintentional weight loss, Inflammatory bowel disease, nutritional aspects of gastrointestinal disease, home nutritional therapy, enteral and parenteral nutrition

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picture of Roshan A. Razik, MD, MPH, FRCPC, FACG

Roshan A. Razik, MD, MPH, FRCPC, FACG

Accepting New Patients

Title(s): Gastroenterologist and Assistant Professor
Department(s): Gastroenterology, Gastroenterology & Hepatology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Hepatobiliary disease, Pancreatic disease, GI oncology, Liver disease, Peptic ulcers, Colon cancer screening, IBD, GI bleeding, Esophageal disorders, H. pylori infection, Hepatitis C, Pancreatic cancer, Gallstone disease

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picture of Xiaocen Zhang, MD

Xiaocen Zhang, MD

Accepting New Patients

Title(s): Gastroenterologist and Assistant Professor
Department(s): Gastroenterology, Gastroenterology and Hepatology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Upper endoscopy, colonoscopy, colon polyp removal, esophageal varices, intestinal bleeding, hereditary colon cancer syndrome, reflux disease, irritable bowel syndrome, diarrhea, constipation, trouble swallowing, abdominal pain, portal hypertension, abnormal liver test, cirrhosis, hepatitis

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