Introduction and Objective.In Poland, during their education at medical universities students are obligated to do internships in a hospital facility. Unfortunately, situations sometime occur when, during the contact with their patients, students commit an error. This may be caused by lack of appropriate knowledge, or due to following wrong patterns. The aim of the study was to present the number and types of medical errors most commonly committed by students. Materials and method. 506 medical students participated in the study. An anonymous on-line survey was conducted and distributed among students of medical universities in Wrocław,