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.

Material and methods:
506 medical students participated in the study. An anonymous on-line survey was conducted and distributed among students of medical universities in Wrocław, Zabrze, Opole, Łódź, Warsaw, Szczecin, Katowice.

Results:
70.9% participants were women. Most of participants were during the 2nd and 3rd years of study (43.1% and 24.9%, respectively). At least half of responders admitted committing at least one error. Most of them were related to hygienic procedures. Errors concerning drug administration or infectious material exposition were less often reported. Many students did nor report the error to their supervisors because of neglecting it or lack of knowledge, or a fear of criticism from the supervisor.

Conclusions:
The error committed by the majority of students related to sanitary procedures; therefore, appropriate measures should be imposed, such as an increase in the education of hygiene. A significant number of students reported that they felt unprepared for their tasks, which is the reason why there should be more emphasis on practical exercises during studies.