Gastroenterology is a branch of medicine that focuses on the functioning and diseases of the digestive system, which includes the esophagus, stomach, intestines, rectum, and digestive glands such as the liver, pancreas, and bile ducts. Additionally, gastroenterology also examines the healthy balance of microorganisms in the body, known as the microbiome, and their impact on processes within the body, such as obesity, depression, and overall human well-being.

A gastroenterologist is a specialized medical doctor who treats conditions like:

  • Indigestion – a digestive disorder caused by factors such as excessive consumption of fatty or spicy foods, alcohol, stress, or medications.

  • Stomach and duodenal ulcers – damage to the mucous membrane caused by excessive production of hydrochloric acid or infection with the Helicobacter pylori bacteria.

  • Reflux disease – the backward flow of stomach contents into the esophagus, causing burning, pain, and irritation of the mucous membrane.

  • Irritable bowel syndrome (IBS) – a functional disorder of the intestines characterized by abdominal pain, bloating, constipation, or diarrhea.

  • Gastritis – an inflammatory condition of the stomach’s mucous membrane, caused by factors such as viral, bacterial, or parasitic infections, alcohol abuse, or the use of anti-inflammatory drugs.

  • Enteritis – an inflammatory condition of the intestines, caused by factors such as bacterial or viral infections, food allergies, or autoimmune reactions.

  • Ulcerative colitis – a chronic inflammatory disease affecting the entire thickness of the colon and rectum.

  • Crohn’s disease – a chronic inflammatory disease that can affect any part of the gastrointestinal tract from the mouth to the anus.

  • Gastrointestinal cancers – malignant tumors that develop in the esophagus, stomach, intestines, or digestive glands.

Symptoms of gastrointestinal diseases may include:

The diagnosis of gastrointestinal diseases is based on medical history, physical examination, laboratory tests (e.g., complete blood count, liver function tests, pancreatic enzyme levels), and imaging studies (e.g., ultrasound, X-ray, computed tomography, magnetic resonance imaging). The most important endoscopic examinations are gastroscopy and colonoscopy, which allow direct visualization and biopsy of the mucous membrane in the esophagus, stomach, duodenum, and large intestine.


Dr Marek Stobiński

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Dr Marek Stobiński

Dr. Marek Stobiński is a gastroenterologist with clinical interests in the treatment of obesity, pancreatic diseases, inflammatory bowel diseases, and irritable bowel syndrome. He performs a full range of endoscopic procedures, including gastrointestinal endoscopy/gastroscopy, colonoscopy, and sigmoidoscopy.


When to seek a gastroenterologist?

  • Persistent abdominal pain and bloating
  • Diarrhea, especially with blood
  • Constipation
  • Rectal bleeding
  • Pain while swallowing food
  • Feeling of food in the esophagus
  • Sudden weight loss
  • Anemia
  • Gluten sensitivity / celiac disease
  • Inflammatory bowel disease
  • Nausea and vomiting, especially with blood


In 2000, he graduated from the Medical Faculty of the Silesian Medical Academy in Katowice.

From 2000 to 2007, he worked as a resident assistant at the Department of Gastroenterology in Katowice. In 2006, he defended his doctoral thesis on pancreatic diseases at the Medical Faculty of the Silesian University of Medicine in Katowice.

In 2007, he completed his specialization in internal medicine.

From 2008 to 2009, he completed second-degree postgraduate studies in advanced endoscopic procedures at “Szpital Papieski” in Policlinico Gemelli in Rome.

From 2009 to 2013, he worked as a full-time senior assistant at the Department of Internal Medicine and Gastroenterology with a Subunit for the Treatment of Inflammatory Bowel Diseases at the MSWiA Hospital in Warsaw.

From 2009 to 2012, he completed his specialization in gastroenterology/gastrointestinal diseases.

In 2014, he worked as a coordinator in the Endoscopy Department at CM Damiana in Warsaw.

Since 2015, he has been working as a consultant gastroenterologist and endoscopist in the NHS.

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