Meet Professor Bloom

Specialist in Inflammatory Bowel Disease, Irritable Bowel Syndrome, and Luminal Gastroenterology

Professor Stuart Bloom is one of the UK’s leading consultant gastroenterologists. He has private practices at The Wellington Hospital and the Physicians' Clinic in London, both part of HCA Healthcare UK. He also works at University College Hospital, where he set up the Bowel Cancer Screening Programme, and is an accredited bowel cancer screening colonoscopist.

Professor Bloom's special interests lie in general gastroenterology, ulcerative colitis, Crohn's disease, IBS, diverticular disease, food intolerance, coeliac disease and gastro-oesophageal reflux.

He has held the position of chair of the IBD section of the British Society of Gastroenterology and is medical director for the UK Inflammatory Bowel Diseases Registry.

Clinical training and experience

1978-1981: Oxford University (first class degree physiological sciences)

  1. Scholar, St John’s College Oxford
  2. First class degree, physiological sciences 
  3. Martin Wronker University prize for physiology


1981-1984: St Thomas' Hospital

Senior house officer and then Medical Registrar at the John Radcliffe Hospital, Oxford.


1991-1994: Medical Research council training fellow at Institute of Molecular Medicine: researching the role of adhesion molecules in the gastrointestinal tract, with a special interest in Inflammatory Bowel diseases (IBD).


1994-1996: Lecturer and senior registrar in the Royal Liverpool Hospital.


1996: Appointed as Consultant Physician and Gastroenterologist at University College London Hospitals.


2008: Reader in the department of Medicine at University College London


2017: Continues to serve as an NHS consultant for UCL Hospitals, with an active involvement in the provision of acute gastroenterology and general medical care.

Private consulting and endoscopy

Consulting at:

  1. Platinum Medical Centre, Wellington Hospital: Mondays, Tuesdays, Thursdays
  2. Physicians Clinic, Devonshire Street: Wednesday afternoons
  3. Endoscopy at the Wellington Hospital: Tuesday mornings


1978: Scholarship, University of Oxford

1981: Martin Wronker Prize, University of Oxford

1994: Leslie Parrott Prize from National Association of Crohn’s and Colitis

2013: Presidents medal, British Society of Gastroenterology for services to gastroenterology

Positions of responsibility

1994-1996: National chair of trainees in Gastroenterology

1997-2006: Member, Specialist Training Committee in Gastroenterology for NE Thames

1997-2001: Chair, NE Thames Training Committee in Gastroenterology

2001-2006: Clinical Director, Department of Gastroenterology, University College London Hospitals

2006-2009: Chairman, Inflammatory Bowel Disease Section of the British Society of Gastroenterology

2006-2008: Chairman of the Bowel Cancer Screening Programme, University College London

2008-2010: Chair of Consultants Committee , UCL Hospitals

2008-2013: Chair, UK NIHR specialty group in gastroenterology, responsible for overseeing UK clinical trials on the NIHR portfolio 

2012-: Chair, UK IBD Registry

Keeping up to date and quality assurance

The General Medical Council (GMC) promotes and protects public health by ensuring proper standards in medicine. The GMC guidance on Maintaining Good Medical Practice can be found at

Keeping up to date

Registered with The Royal College of Physicians for Continuous Professional Development; exceed the minimum annual credit requirements every year. Fully revalidated in general medicine and gastroenterology (2019).

Maintaining performance

An experienced and expert endoscopist , having carried out over 8000 procedures. Success rate in colonoscopy is over 95% and complication rate is less than 1 in 1000 procedures. Performance in endoscopy regularly audited; involved in several departmental audits, including the use of azathioprine and methotrexate in inflammatory bowel disease, the outcome of endoscopy for gastrointestinal bleeding, and the complications of percutaneous endoscopic gastrostomy

Teaching and training

Tutor, medical undergraduates from the Royal Free and University College London Medical School; twice cited as a ‘valued teacher’.

In 1997 designed the day release programme for North East Thames’ trainees ‘Day Release’ Training in Gastroenterology, and this is still in use.

Research and publications

Research into IBD has always been a core component of my work. I am clinical lead for research in gastroenterology at University College London Hospitals, and am always keen to offer patients entry into clinical trials if suitable.

I was chair of the UK clinical research network from 2008 to 2013 and now head the UK national IBD registry, which is designed to improve national standards of care through better recording of routine clinical details.

I have authored two books and a number of research papers, as detailed below:


Practical Gastroenterology: ed. Stuart Bloom. Published by Martin Dunitz, 2002. 45 authors (680 pp)

Oxford Handbook of Gastroenterology and Hepatology, 3rd edition 2022, edited by Stuart Bloom, Daniel Marks and George Webster. Translated into five languages.

Original papers

Adhesion molecules in the Gastrointestinal tract. A thesis for Doctorate of Medicine, Oxford University. Awarded October 1994.


Bloom SL, Fleming K, Chapman RWC. Adhesion molecule expression in primary sclerosing cholangitis and primary biliary cirrhosis. Gut 1995;36(4):604-609


Bloom SL, Jewell DP, Simmons D. Adhesion Molecules-1 (ICAM-1), ICAM-3 and B7 are not expressed by epithelium in normal or inflamed colon. Clinical and Experimental Immunology 1995;101(1):157-163


Bloom SL, Fleming K, Chapman RWC, Neuberger J, Hubscher S. Inappropriate expression of blood group antigens in hepatic allografts. Hepatology 1994;19(4):876-881.


Bloom SL, Heryet A, Fleming K, Chapman RW. Inappropriate expression of blood group antigens on biliary and colonic epithelia in primary sclerosing cholangitis. Gut 1993;34(7):977-983.


Bloom SL. Mast cells and Eosinophils in Inflammatory Bowel Disease. In: Inflammatory Bowel Disease. 3rd Edition, Edited by RN Allen, MRB Keighley, J Alexander-Williams, VW Fazio, S Hanauer, JM Rhodes


Bloom SL, Ireland A, Ryley NG, ChapmanRW, Lindsell D. Correlation between hepatic ultrasound and histology. European Journal of Gastroenterology and Hepatology 1992;4(1):39-42


Oshitani N, Campbell A, Bloom SL, Kitano A, Kobayashi K, Jewell, DP. Adhesion molecule expression of vascular endothelium and nitroblue tetrazolium reducing activity in human colonic mucosa. Scandinavian Journal of Gastroenterology 1995;30:915-920


Khan, RU, Tong, CYW, Bloom S, Gilmore IT, Toh CH, Bolton-Maggs P, Beeching NJ and Hart, CA. Evaluation of two simplified methods for genotyping hepatitis C virus. Journal of Medical Virology 1997;52(1):35-41.


Briskin M, Winsor-Hynes D, Shyjan A, Bloom S, Wilson J, McEvoy L, Butcher EC, Kassam N, Mackay CR, Newman W, Ringler DJ. Human mucosal addressin cell adhesion molecule-1 is preferentially expressed in intestinal tract and associated lymphoid tissue. American Journal of Pathology 1997;151(1):97-110.


Harbord M, Hankin A, Bloom S, Mitchison H. Association between p47phox pseudogenes and inflammatory bowel disease. Blood 2003;101:3337


Basset C, Holton J, Bazeos A, Vaira D, Bloom S. Are Helicobacter species and enterotoxigenic Bacteroides fragilis involved in inflammatory bowel disease? Digestive Diseases and Sciences 2004; 49(9):1425-32


Bloom S, Kiilerich S, Lassen MR, Forbes A, Leiper K, Langholz E, Irvine EJ, O’Morain C, Lowson D, Orm S. Low molecular weight heparin (tinzaparin) vs. placebo in the treatment of mild to moderately active ulcerative colitis. Alimentary Pharmacology & Therapeutics 2004;19(8):871-878


Dhar A, Johnson KS, Novelli MR, Bown SG, Bigio IJ, Lovat LB, Bloom SL. Elastic scattering spectroscopy for the diagnosis of colonic lesions: initial results of a novel optical biopsy technique. Gastrointestinal Endoscopy 2006;63:257-61


Marks DJB, Harbord MWN, MacAllister R, Rahman FZ, Young J, Al-Lazikani B, Lees W, Novelli M, Bloom S, Segal AW. Defective acute inflammation in Crohn’s disease: a clinical investigation. Lancet 2006;367:668-678


Harbord MWN, Marks DJB, Forbes A, Bloom SL, Day RM, Segal AW. Impaired neutrophil chemotaxis in Crohn’s disease relates to reduced production of chemokines and can be augmented by granulocyte-colony stimulating factor. Alimentary Pharmacology & Therapeutics 2006;24:651-660


Marks DJB, Rahman FZ, Novelli M, Yu RC, McCartney S, Bloom S, Segal AW. An exuberant inflammatory response to E coli: implications for the pathogenesis of ulcerative colitis and pyoderma gangrenosum. Gut 2006;55:1662-1663

Book a consultation

To make an appointment, or if you have any questions, please contact my secretary, Orsi Baranya:


T:  +44 20 7483 5662
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