The article is devoted to the study of factors that have a negative impact on the well-being of employees in the workplace. Special attention is paid to the problem of presenteeism on the example of a large metallurgical enterprise. A review of foreign and domestic publications allows concluding that until now specialists do not have reliable and valid tools for studying the presenteeism phenomenon in organizations. The purpose of the research presented in the paper is to examine influence of the factors of the intra-organizational environment on the personnel well-being and assess the level of presenteeism at the enterprise. Empirical data were obtained by conducting a sociological survey of various categories of workers, as well as assessing the impact of presenteeism on the economic indicators of the studied enterprise. For the subsequent in-depth study of health problems in the workplace, the authors have developed a research tool based on the use of a digital service, which allows monitoring the self-feeling of employees by the self-assessment method, which determines the level of physical and psychosocial well-being of staff.