As a gastroenterologist, I have always focused on prevention as well as on the examination and treatment of patients with complaints. I always try to create an informal atmosphere in my consultations and to discuss the issues with the patient. Prevention is my most important policy! Since a significant number of tumours in the gastrointestinal tract develop from so-called precancerous lesions, the recognition and treatment of these precancerous lesions prevents the development of the tumour.