Dr. Arun Rajendran

Dr Arun Rajendran is a leading Consultant Gastroenterologist and General Physician practicing at OneWelbeck (London), One Stop Healthcare (Hemel Hempstead), The Clementine Churchill Hospital (Harrow) and The London Clinic

With extensive expertise in complex gut health, Dr Rajendran specializes in rapid diagnostic assessment and compassionate care for a full spectrum of gastrointestinal symptoms, including:

• Stomach & Upper Gut: Persistent acid reflux, chronic heartburn, indigestion, nausea, swallowing difficulties, and H. pylori.
• Bowel & Abdominal Concerns: Abdominal pain, severe bloating after eating, altered bowel habits, chronic diarrhoea, constipation, and Irritable Bowel Syndrome (IBS).
• Red-Flag Investigations: Rectal bleeding (blood in stool), unexplained weight loss, and iron-deficiency anaemia.
• Chronic Conditions: Crohn’s disease, Ulcerative Colitis (IBD), Coeliac disease, and Food intolerances/Malabsorption

Advanced, Painless Diagnostics

An expert interventional endoscopist, Dr Rajendran performs diagnostic and therapeutic Gastroscopy (OGD), Colonoscopy, and Polyp removal (Polypectomy) under dedicated sedation, maintaining industry-leading comfort scores and adenoma detection rates for bowel cancer screening

He has more than ten years' experience, having graduated in 2001 and completed his postgraduate specialist gastroenterology training in North West London. He also spent 3 years in St Marks Hospital undertaking postgraduate research and a teaching fellowship. In 2020, he was awarded a research MD from Kings College London for his work examining the learning curve of colonoscopic polypectomy. His work resulted in peer-reviewed publications as well as the 2016 NIHR CLAHRC support award, the 2016 ASGE Cook Medical Marsha Dreyer Award, and the 2016 BSG best teaching abstract award. He has also presented his work at both national and international conferences.

Dr Rajendran completed his PG certificate in Medical Education in 2015, leading to his accreditation to the Higher Education Academy (FHEA). He is active in research and teaching, is a Honorary Senior Clinical Teacher at Imperial College, London and Honorary Senior Clinical Teacher at Brunel Medical School. He also peer reviews articles for international journals, contributes to research by recruiting patients for clinical trials, and presents at national and international meetings on topics of cancer screening, training, and inflammatory bowel disease. He regularly contributes nationally and internationally as part of a multidisciplinary working group for the improvement of endoscopy training quality.

In 2018, Dr Rajendran was appointed as a full-time substantive consultant in Gastroenterology and General Internal Medicine at Hillingdon Hospital NHS Foundation Trust, where he is the current Endoscopy Training Lead for the Trust. He offers outpatient and interventional endoscopy services at Hillingdon and Mount Vernon Hospitals. He also covers emergency cases at Harefield Hospital.

Personalised, Multi-Lingual Patient Care

Dr Rajendran believes in clear, unhurried consultations. Consultations are available in English, Hindi, Tamil, and Kannada, ensuring patients feel completely understood.

Same-week appointments and endoscopy slots are available for insured self-funding patients across Central London, Uxbridge, Northwood, Harrow, Buckinghamshire and Hertfordshire.