- Interventional endoscopy: ESD, POEM and EFTR
- Endoscopic ultrasound with fine needle biopsy
- ERCP with cholangioscopy
- Gastrointestinal oncology
- Hepatology and biliary disease
The principles behind the practice and the approach to the patient are set out under philosophy and purpose. Research, teaching and publications are presented in detail under scientific work.
Dr. Thomas Thomaidis is a gastroenterologist and hepatologist specialising in interventional endoscopy and gastrointestinal oncology. He is an associate professor of gastroenterology, with advanced training in Germany, Japan and Canada.
Dr. Thomaidis was born and raised in Athens, Greece. He graduated with honors from the 2nd High School of Papagou and then entered the Medical School of the University of Crete with the system of the pan-Hellenic examinations. In 2003 he graduated first from the Medical School of Athens University with degree “Excellent”. During his studies he attended as “clinical elective” at the Medical School of the “Semmelweis” University of Budapest, at the Medical School of the University of Prague and at St. George’s Hospital in London, United Kingdom. As an undergraduate student, he received scholarships from the State Scholarship Foundation (IKY) and the Anagnos Foundation, while after completing his studies he worked as a rural doctor at the regional clinic of Arkesini in Amorgos.
In 2004 he received the license to practice medicine in Germany. In 2006 he completed his doctoral dissertation at Johannes-Gutenberg University in Mainz, Germany where he remained and completed the medical specialty of Internal Medicine and Gastroenterology in 2014.
After his residency, Dr. Thomaidis remained at the University Clinic of the Johannes-Gutenberg Universität in Mainz where he performed extensive clinical, didactic and research work with multiple publications in prestigious international journals. As a result, in 2017 he was named Ass. Professor of Gastroenterology at the Johannes-Gutenberg University. His clinical experience includes the wide range of gastroenterology, hepatology, gastrointestinal tumors and invasive endoscopy.
In 2017 he was trained in the latest advanced techniques of minimally invasive endoscopy (ESD, POEM, EFTR) at the largest endoscopy unit worldwide, at the University of Fudan in Shanghai, China under the guidance of Professor PH. Zhou . In 2018-2019 Dr. Thomaidis was trained in therapeutic and invasive endoscopy (EUS, ERCP) in St. Michael’s Hospital, University of Toronto, Canada , which is one of the few recognized “Centers of Excellence” by the World Intelligence Agency (WEO) .
During his clinical career he was awarded the Walter-Krienitz Prize for his research on gastric cancer, and has received multiple awards and travel grants for presentations at international conferences. Since November 2019, he has been the Secretary General of the Hellenic Society of Digestive Oncology.
Dr. Thomaidis is a member of the Hellenic Gastroenterological Society (EGE), the Hellenic Society of Digestive Oncology (HSGO), the German Gastroenterological Society (DGVS), the American Society of Endoscopy (ASGE), etc.
He participates as a speaker and President in many international conferences, while at the same time he is investigator in clinical trials on invasive endoscopy and gastroenterology oncology.
Since July 2019, he has returned to Greece and maintains a private practise in Maroussi. Since April 2024 Dr. Thomas Thomaidis is the Director of A’ Gastroenterology Clinic at the Athens Medical Center.
The range of conditions treated is set out on the areas of expertise page, and the diagnostic and therapeutic methods on the page for endoscopy.
Frequently asked questions
What does Dr Thomaidis specialise in?
Gastroenterology, hepatology and gastrointestinal oncology, with particular focus on interventional endoscopy. He trained in the minimally invasive techniques ESD, POEM and EFTR at Fudan University in Shanghai, and in therapeutic endoscopy with endoscopic ultrasound and ERCP at St Michael’s Hospital, University of Toronto.
Where did he practise before Athens?
In Germany. He completed his doctoral thesis in 2006 and his specialty training in internal medicine and gastroenterology in 2014 at the Johannes Gutenberg University of Mainz, where he remained at the university clinic and was appointed associate professor of gastroenterology in 2017.
Which scientific societies is he a member of?
The Hellenic Society of Gastroenterology, the Hellenic Society of Gastrointestinal Oncology, the German Society of Gastroenterology (DGVS) and the American Society for Gastrointestinal Endoscopy (ASGE).
Content last updated: September 2026 (16/09/2026).
