Dr Karl Hazel

About

Dr. Karl Hazel is a Consultant Gastroenterologist with a special interest in Inflammatory Bowel Disease and Bowel Ultrasound. He graduated from Trinity College Dublin in 2009 with a degree in Biochemistry and Structural Biology and subsequently obtained his Medical Degree (MB BCh BAO) from University College Dublin in 2014. He was admitted as a Member of the Royal College of Physicians in Ireland in 2016. 

Following completion of Higher Specialist Training in Gastroenterology and Hepatology in Ireland, he completed an Advanced Clinical Fellowship in Inflammatory Bowel Disease in University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom. He joined Connolly Hospital Blanchardstown as a Consultant Gastroenterologist and Honorary Senior Clinical Lecturer with RCSI in 2024. His subspecialty interests are Inflammatory Bowel Disease, Bowel Ultrasound, Bile Acid Metabolism and PSC-IBD. He is a registered Bowel Screen Endoscopist. He holds a Medical Doctorate (MD) from the Royal College of Surgeons in Ireland, examining the effects of Bile Acids on Inflammation and Fibrosis in Inflammatory Bowel Disease and is an active member of the Irish Society of Gastroenterology (ISG), the International Bowel Ultrasound Group (IBUS) and is currently the joint National Representative for Ireland for the European Crohn's and Colitis Organisation (ECCO). 

He also sits on the IBD Working Group for the National Clinical Programme for Gastroenterology and Hepatology in Ireland and continues to be active in IBD research in Ireland, both locally and as part of the INITIative IBD national research network. He has multiple peer reviewed publications, presentations and abstract publications. He was a member of the panel formulating the updated ECCO Ulcerative Colitis Medical and Surgical Guidelines, published July 2026.