Introduction and objective:
Background: Back pain is particularly common among many chronic pain ailments. This problem mainly affects office workers, due to the long working time daily in a sitting position. The aim of the study was to assess back pain in a group of office workers, as well as to establish the relationship between the intensity and frequency of pain depending on duration of employment and gender.

Material and methods:
The study was conducted using an author constructed questionnaire, and included 120 respondents who met the criteria for inclusion. The NRS scale was used to assess pain intensity.

Results:
In the studied group of office workers pain most frequently occurred in the lumbosacral spine (66.7%), while most rarely in the thoracic section (14.2%). Females and males almost equally often reported pain in all sections of the spine. More than a half of the respondents reported pain while sitting, females more often than males. Over 80% of respondents indicated that back pain has a negative impact on work performance. Less than 30% of the surveyed office workers did not apply the principles of work ergonomics.

Conclusions:
1. Spinal pain symptoms are most often located in the lumbosacral spine, regardless of gender. 2. The frequency and intensity of pain experienced by office workers does not depend on gender. 3. Work experience does not affect the intensity and frequency of occurrence of back pain in office workers. 4. Workshops, instructional videos, training for office workers on the practical application of the principles of work ergonomics should be introduced.