Professor Owen Epstein
MBBCh (Hons), FRCP
Consultant Gastroenterologist
Professor Owen Epstein is a leading Consultant Gastroenterologist renowned for delivering a gentler, smarter, and more precise approach to digestive health.
With over 200 peer-reviewed publications and decades of experience at the Royal Free, he combines clinical excellence with cutting-edge technology to offer patients a clear diagnosis without unnecessary invasive procedures.
A More Intelligent Way to Investigate Gut Symptoms
Professor Epstein’s approach is built around three integrated layers of understanding:
- “Hardware” — Looking inside the gut
Using advanced capsule endoscopy, a pill-sized camera that travels naturally through the digestive tract, he can assess your gut comfortably and accurately—often avoiding traditional endoscopy. - “Middleware” — Understanding your microbiome
Through targeted breath testing and microbiome analysis, he identifies how gut bacteria and fermentation may be driving symptoms such as bloating, discomfort, or food intolerance. - “Software” — The brain–gut connection
A recognised expert in the vagus nerve, Professor Epstein assesses how the nervous system regulates digestion using heart rate variability testing and offers non-invasive vagus nerve stimulation where appropriate.
Designed Around You — A Gentler Patient Journey
- Direct-to-test options — where appropriate, move straight to advanced diagnostics
- Video consultations — expert care from the comfort of your home
- Home-based testing — convenient, modern, and efficient
- Clear answers, not endless investigations
This approach reduces uncertainty, shortens pathways, and ensures that every test has purpose and meaning.
Areas of Expertise
- Capsule endoscopy and colon capsule screening
- Unexplained digestive symptoms and functional gut disorders
- Vagus nerve dysfunction and autonomic imbalance
- Bloating, food intolerance, and microbiome disorders
- Non-invasive, patient-centred diagnostic pathways
Philosophy: Smarter Information. Simpler Care.
Professor Epstein believes that the best care begins with understanding. By combining advanced diagnostics with thoughtful interpretation, he helps patients move from uncertainty to clarity—quickly, safely, and with confidence.
Why Patients Choose Professor Epstein
- Internationally recognised expert in capsule endoscopy
- Pioneer of non-invasive, patient-friendly diagnostics
- Integrates cutting-edge science with personalised care
- Focused on delivering answers—not just tests
Personal profile:
Outside of medicine, I have always been drawn to the art of communication and storytelling. I enjoy translating complex ideas into simple, meaningful narratives—whether through writing, visual design, or short educational videos. Music, particularly from the 1960s, has been a lifelong passion, and I value time spent with family and friends, often bringing people together through shared experiences and a sense of humour. These interests reflect how I approach life and medicine alike: with curiosity, clarity, and a genuine interest in understanding people as individuals.
Financial and part-time positions:
Practice centred at the Royal Free London within the private practice unit.
Director of IMIGe LTD
Leadership positions:
Service lead for Innovation in Minimally Invasive Gastroenterology (IMIGe) group , PPU Royal Free
Hospital Locations
Royal Free Hospital
Country of qualification
South Africa
Languages spoken
English
Specialities
- Gastroenterology
Memberships
- British Society of Gastroenterology
- Royal College of Physicians
Registration and licensing
GMC:2231024
Procedures offered
- 72-hour heart rate variability assessment using lightweight HRV monitor (Bodyguard3)
- Echogastrography (ultrasound of stomach following cup of soup) to assess stomach pump function
- Hydrogen and methane breath testing to assess small intestinal bacteria overgrowth and abnormal fermentable FODMAP sugars
- Small and large bowel camera capsule endoscopy
Clinical interests
- Patient-First, Minimally Invasive Care Committed to a gentler, less intrusive diagnostic journey, prioritising patient comfort while maintaining rigorous, evidence-based standards.
- Innovative Diagnostic Pathways Early adopter of advanced technologies to streamline assessment and reduce reliance on invasive procedures where possible.
- “Hardware” – Structural Assessment of the Gut Internationally recognised expertise in capsule endoscopy, using swallowable camera technology to provide safe, accurate evaluation of the digestive tract and to determine who truly requires conventional endoscopy.
- “Middleware” – The Colonic Microbiome Specialist interest in the gut microbiome as a key regulator of digestion, immunity, and metabolism, supported by advanced breath testing and microbiome-focused diagnostics.
- “Software” – Brain–Gut Axis & Vagus Nerve Focus on the vagus nerve as the body’s bidirectional communication network between brain and gut; dysfunction may underpin many symptoms in the absence of structural disease.
- Heart Rate Variability (HRV) & Autonomic Function Use of medical-grade HRV monitoring to assess autonomic balance and vagal tone as part of a comprehensive diagnostic framework.
- Non-Invasive Vagus Nerve Stimulation Expertise in therapeutic modulation of the vagus nerve to restore autonomic balance and improve functional gastrointestinal symptoms.
- Integrated “Hardware–Middleware–Software” Model A holistic, precision-based approach that combines structural, microbial, and neurophysiological insights to deliver personalised care—providing smarter information and, ultimately, simpler care.
Research interests
- The pathophysiology of endoscopy negative gastrointestinal disorders
- The role of the vagus nerve in gastrointestinal health and disease
- Treatment of gastrointestinal disease with non-invasive vagus nerve stimulation
- Defining the role of new technologies, including PillCam and non-radioactive breath testing in gastrointestinal disorders