Consultant Gastroenterologist · The Shard & London Bridge Hospital

Expert care for acid reflux, swallowing problems and digestive health

Dr Sebastian Zeki is a Consultant Gastroenterologist seeing private patients in central London, with particular expertise in acid reflux, Barrett's oesophagus, swallowing difficulties, eosinophilic oesophagitis and early cancer detection and treatment, as well as general gastroenterological conditions. He is one of a small number of London consultants personally delivering advanced reflux diagnostics alongside JAG‑accredited endoscopy.

Book an appointment Call 020 3301 4916

Dr Sebastian Zeki, Consultant Gastroenterologist

Dr Sebastian Zeki MA MSc MBBS MRCP PhD

Conditions & symptoms

Conditions and symptoms treated

Dr Zeki investigates and treats the full range of upper and lower gastrointestinal conditions. The most common reasons for referral are listed below.

Acid reflux & heartburn

Burning, regurgitation, night‑time symptoms, or reflux that persists despite medication — including silent reflux affecting the throat and voice.

Barrett's oesophagus

Expert surveillance and, where needed, endoscopic treatment of the pre‑cancerous change that long‑standing reflux can cause.

Swallowing problems

Food sticking, painful swallowing, or the sense that something is not passing normally — investigated with endoscopy and high‑resolution manometry.

Eosinophilic oesophagitis

An increasingly common allergic condition of the oesophagus causing food impaction and swallowing difficulty, particularly in younger adults.

Bloating & digestive issues

Bloating, altered bowel habit, discomfort and irritable bowel syndrome — investigated carefully, explained clearly, managed sympathetically.

Food allergies & intolerance

How food reactions affect the gut, and how to separate true allergy from intolerance and other causes of symptoms.

Gastrointestinal cancer

Rapid investigation of alarm symptoms, endoscopic diagnosis, and minimally invasive endoscopic resection of early cancers.

Endoscopy & reflux testing

Gastroscopy, colonoscopy, BRAVO wireless pH monitoring, pH‑impedance and high‑resolution manometry.

Why patients are referred to Dr Zeki

Specialist reflux and swallowing diagnostics

Persistent reflux and swallowing symptoms are best managed with objective physiological testing, so that treatment is directed at the underlying cause. Dr Zeki personally performs and interprets the following investigations.

BRAVO wireless pH monitoring

A capsule placed painlessly at gastroscopy measures acid exposure for up to 96 hours — no tube, normal daily life, and the highest diagnostic yield for unproven reflux.

pH‑impedance studies

Detects both acid and non‑acid reflux and links episodes to your symptoms — essential when tablets haven't worked or the diagnosis is in doubt.

High‑resolution manometry

Maps the pressures of every swallow to diagnose motility disorders such as achalasia and oesophageal spasm, and to plan any anti‑reflux surgery safely.

About Dr Zeki

Consultant at one of the UK's leading centres, seeing private patients in London Bridge

Dr Zeki is a consultant gastroenterologist at Guy's and St Thomas' NHS Foundation Trust and an honorary senior clinical lecturer at King's College London. He trained at Cambridge and UCL, completed a PhD in the genomics of oesophageal cancer, and undertook advanced training in Cambridge and Tokyo.

He performs gastroscopy and colonoscopy in JAG‑accredited endoscopy units, including endoscopic diagnosis and resection of early cancers, and aims to make every consultation unhurried and clear.

More about Dr Zeki

The Shard, London — HCA UK at The Shard Tuesday consultations · SE1 9BS

London Bridge Hospital JAG‑accredited endoscopy · SE1 2PR