Studying and improving the theory of errors of doctors has always been important, and today it has become especially relevant.The article lists the main provisions of the advanced version of the theory of errors of doctors. The main content of the articleis devoted to four important aspects of the problem of physician errors. The article states the main contradiction of the problemof errors in medicine. The structure of general objective and subjective causes of medical errors is shown. The main optionsfor doctors to experience errors that complicate doctors’ mutual understanding in this problem are formulated. For the fi rsttime, the reasons for the denial of errors by doctors are summarized. These aspects and conclusions on them are the result ofan analysis of publications on the problem of errors in medicine, repeated discussions of the problem on professional medicalsites. The content of these aspects was based on its own material on error analysis and observation from practice. The aboveaspects and their conclusions need not so much to be confi rmed by special studies, but rather to refl ect on their role and placein the problem of errors. The general objective and subjective reasons for the occurrence of medical errors are shown inconnection with their possible "guilt". Lack of experience is presented as the most common cause of medical errors. Variousoption for doctors to experience errors are presented as a reason that makes it diffi cult for doctors to understand this problem.