Research objectives: The aim of this master thesis was to analyse the structure and number of patients treated for lumbar pain syndrome in the Department of Emergency Medicine of the Split-Dalmatia County in the period from March 2019. to March 2022. Another research objective was to determine whether there is a significant impact of the pandemic of the disease COVID-19 on the number of patients treated for lumbar pain syndrome through the analysis of data on the number of patients treated in the period before the pandemic (March 2019. - March 2020.), the period of adaptation to the pandemic (March 2020. - March 2021.) and the period after adaptation to the pandemic (March 2021. - March 2022.). Methods: The research was conducted on secondary data obtained from the Department of Emergency Medicine of the Split-Dalmatia County. The sample consisted of all paediatric (0 - 19), working (20 - 64) and retired (65 - 100) age patients, male and female, treated for lumbar pain syndrome on an outpatient basis or through the intervention of an emergency team in the period from March 2019. - March 2022. Results: This research showed changes in the number of patients treated for lumbar pain syndrome at the Department of Emergency Medicine of the Split-Dalmatia County in the period from March 2019 to March 2022, which were affected by the COVID-19 pandemic. Conclusions: The research showed that there is a significant difference in the number of outpatients treated at the Department of Emergency Medicine of the Split-Dalmatia County during the period before the COVID-19 pandemic (March 2019. - March 2020.), the period of adaptation to the conditions of the pandemic (March 2020. - March 2021.) and the period after adaptation to the conditions of the pandemic (March 2021. - March 2022.). On the other hand, no significant difference was found in the number of interventions by emergency teams in patients with lumbar pain syndrome in the observed time period. In addition, a statistically lower number of outpatients treated in the period of adaptation to pandemic conditions was found compared to the period before the pandemic, while no statistically significant difference was found in the number of outpatients treated in the period after adaptation to pandemic conditions compared to the period before the pandemic. Also, no statistically significant difference was found in the number of interventions by emergency teams for patients with lumbar pain syndrome comparing the period before the pandemic compared to the period of adaptation to the pandemic and comparing the period before the pandemic compared to the period after adaptation to the pandemic.