Jay Thiagarajah, MD, PhD

Dr. Jay Thiagarajah is a pediatric gastroenterologist at Boston Children’s Hospital and co-director of the Congenital Enteropathy Program, where he specializes in treating children with complex gastrointestinal and nutritional disorders, including inflammatory bowel disease, celiac disease, eosinophilic esophagitis, GERD, chronic diarrhea, and rare congenital enteropathies such as microvillus inclusion disease. He also serves as an assistant professor of pediatrics at Harvard Medical School and is part of the hospital’s Precision Medicine Service, helping develop individualized treatment approaches for patients with rare digestive conditions. Dr. Thiagarajah earned his medical degree from St. George’s University of London, completed his residency at Massachusetts General Hospital, and pursued fellowship training in pediatric gastroenterology at Boston Children’s Hospital. In addition to his clinical care, he is actively involved in translational research …focused on intestinal biology, epithelial transport disorders, and innovative therapies aimed at improving outcomes for children with severe gastrointestinal diseases.