Por qué es un doctor de primer nivel/Professional statement/Perché è un dottore di prim’ordine

Dr John Martin is a highly-experienced gastroenterologist and endoscopist based in London and holds an NHS Consultant post at Imperial College (ICL). He is an expert in colorectal cancer screening, therapeutic and diagnostic colonoscopy and has 25 years' experience of managing all aspects of gastroenterology including abdominal pain or discomfort, reflux disease, diarrhoea and constipation, rectal bleeding, irritable bowel syndrome, Crohn’s disease and ulcerative colitis

Graduated from Cambridge University and King’s College Hospital, London in 1990, Dr Martin completed his gastroenterology training within North West London. In 2002, he was awarded an MD from the University of London in bowel cancer screening and became a consultant at Chelsea and Westminster Hospital before joining Charing Cross Hospital in 2006. Dr Martin refined his skills in colonoscopy to ensure they are always safe, high-quality and comfortable for his patients. 

Dr Martin teaches colonoscopy both within the NHS Trust and also at national screening centres. He is a bowel cancer screening accredited colonoscopist and an examiner for BCSP colonoscopy accreditation. He has authored numerous peer reviewed publications.  

Dr Martin is director of the West London Bowel Cancer Screening Centre; he is the national advisor to Public Health England on endoscopy within the Bowel Cancer screening service and chairs the national advisory committee on quality and safety of endoscopy within screening. He forms an integral part of numerous other professional bodies and has been widely published in peer-reviewed journals. 

Especialista en


Index What is a colonoscopy? &a...

Capsule endoscopy

What is a capsule endoscopy? A capsule endoscopy is a minimally invasive method of examining the digestive system. It’s a breakth...

Inflammatory bowel disease (IBD)

What is inflammatory bowel disease (IBD)? Inflammatory bowel disease (IBD) a medical term used to describe a group of diseases that cause &...


What is a polypectomy? A polypectomy is a minimally-invasive procedure carried out with a colonoscope or...

Irritable bowel syndrome (IBS)

What is irritable bowel syndrome? Irritable bowel syndrome (IBS) is a functional disorder of the large intestine....

Bloated stomach

Index: 1. What is a bloated stomach? ...

Enfermedades, Pruebas y Tratamientos

  • Abdominal pain
  • Acid reflux
  • Barrett's oesophagus
  • Bloated stomach
  • Blood in stool (rectal bleeding)
  • Bowel cancer
  • Bowel cancer screening
  • Capsule endoscopy
  • Chronic diarrhoea
  • Coeliac disease
  • Colic
  • Colitis
  • Colon cancer
  • Colonoscopy
  • Colorectal cancer
  • Constipation
  • Crohn's disease
  • Diarrhoea
  • Digestive diseases
  • Diverticular disease
  • Dysmotility
  • Dysphagia
  • Eating disorders
  • Endoscopic mucosal resection (EMR)
  • Endoscopic ultrasound (EUS)
  • Endoscopy
  • Epigastric hernia
  • Food allergies
  • Food intolerance
  • Food intolerance test
  • Gastric balloon
  • Gastric band
  • Gastric bypass
  • Gastrointestinal bleeding
  • Gastrointestinal endoscopy
  • Gastroscopy
  • Halitosis
  • Helicobacter pylori
  • Hepatic encephalopathy
  • Hiatal hernia
  • Incisional hernia
  • Indigestion (dyspepsia)
  • Inflammatory bowel disease (IBD)
  • Iron deficiency
  • Irritable bowel syndrome (IBS)
  • Lactose intolerance
  • Lactose intolerance test
  • Liver cancer
  • Malnutrition
  • Morbid obesity
  • Nutrition
  • Obesity
  • Oesophagitis
  • Pancreatic cancer
  • pH monitoring
  • Piles (haemorrhoids)
  • Polypectomy
  • Polyps
  • POSE procedure
  • Rectal cancer
  • Rectosigmoidoscopy
  • Stomach cancer
  • Stomach reduction
  • Stomach ulcer
  • Ulcerative colitis
  • Weight loss

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Valoraciones de pacientes


Es un servicio de mensajería privada y videoconferencia que te permite realizar una consulta médica conmigo en cualquier momento y lugar./A private messaging and video conference service that allows you to contact the best doctors at any time and place./È un servizio di messaggistica privata e videoconferenza che ti permette di contattare i migliori medici in ogni momento e in qualsiasi luogo.



How might ulcerative colitis develop over time?
In one of today's articles, we take a close look at ulcerative colitis, as esteemed gastroenterologist and endoscopist, Dr John Martin, reveals the most common causes of the colon-affecting condition, and reveals how patient's can monitor the progression of the condition, and what they can expect in terms of the condition's progression over time.
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Understanding irritable bowel syndrome (IBS)
Have you been experiencing abdominal pain with diarrhoea, constipation, or both? These are the main symptoms of irritable bowel syndrome, a condition which can be managed with specialist help. Learn from Dr John Martin, a leading consultant gastroenterologist and expert in treating IBS, about what IBS is, its symptoms, how it's diagnosed and how it's treated.
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Is bloating ever a sign of something serious?
Bloating is a common sensation that many of us have experienced. While it's very rare that it's a sign of something serious, it's valuable to know when to see a specialist for advice. Dr John Martin, a gastroenterologist, explains the causes of bloating so that you know when to seek medical help.
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Dysmotility: a focus on the oesophagus
Oesophageal dysmotility is a condition in which the muscles in the oesophageal wall fail to contract as they should. This may result in discomfort and/or difficulty in swallowing. Dr John Martin is an expert in treating dysmotility of the intestine, and here he explains in detail about causes and treatment of dysmotility in the oesophagus.
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What to expect after a colonoscopy?
Have you been told that you need a colonoscopy? A colonoscopy allows your doctor to take a look at your colon and rectum to find cancer or polyps. It is a safe examination with very few risks. Dr John Martin tells us a bit more about what to expect after a colonoscopy and what recovery looks like.
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The pros and cons of a virtual colonoscopy
Colonoscopies after the age of 50 become a regular procedure to check inside the colon for abnormalities. Nowadays, a virtual colonoscopy is available to patients and offers a non-invasive and less aggressive alternative to a regular colonoscopy. But what happens during the procedure and can it offer more reliable results? Dr John Martin, a leading gastroenterologist in London, explains what a virtual colonoscopy is and why it might be right for you.
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Colon polyps and the polypectomy procedure
Polyps are abnormal growths within the colon that vary in size from a few millimetres to several centimetres. Most of these are not cancerous, but some have the potential to develop into a cancer. Because of this risk, your doctor will very likely recommend that these are removed via a polypectomy. Here gastroenterologist Dr John Martin talks you through all you need to know about polyps and having a polypectomy.
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Capsule endoscopy: how long does it take to pass?
Capsule endoscopy is a technique that allows visualisation of the entire gastrointestinal tract to enable doctors to diagnose conditions such as coeliac disease and inflammation of the gut. Expert gastroenterologist Dr John Martin explains how the procedure works and how long the capsule takes to pass.
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How to relieve symptoms of IBS
The cause of irritable bowel syndrome (IBS) is not entirely understood. In IBS, the gut appears normal, with no inflammation or any abnormal findings on investigation. IBS is sometimes called a “functional” disorder because symptoms are thought to be caused by the way in which the gut works, for example, the passage of food through the gut may be either too slow or too quick. In addition, the gut may be oversensitive to distension by either gas or food content, causing pain or discomfort. The symptoms of IBS may be exacerbated by certain foods or stress. Here to tell us more about IBS and how we can manage it is Dr John Martin.
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What should I know about a colorectal cancer screening?
Colorectal cancer is the second commonest of cancer deaths in the UK, affecting 1 in 18 men and 1 in 20 women. However, the disease is entirely preventable by the early removal of non-cancerous growths (polyps), which are detected through screening tests. Expert gastroenterologist Dr John Martin explains more...
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