Introduction: Low back pain continues to be one of the main symptoms in personnel carrying out loads, but this was not widely investigated in the context of COVID-19. Objective: To determine the socio-occupational factors associated with low back pain in technicians and nurses of critical medical services who treated COVID-19 patients. Material and Methodos: Cross-sectional analytical study. Through a virtual survey, information was collected from the nursing staff of the general ICU, COVID-19 ICU and Traumatology services of a Social Security hospital in Lima-Peru. The main variable was low back pain, this was crossed with other variables of interest through descriptive and analytical statistics. Results: Of the 265 responses, 62% (165) reported having low back pain. In the multivariate model, it was found that there was a greater suffering from low back pain according to having more years of work (RPa: 1,03; CI: 95%: 1,01-1,06; p-value=0,008) and if they had previously had a work disability (RPa: 1.45; 95% CI: 1.25-1.68; p-value=<0.001), on the other hand, the older the respondents, the less low back pain (RPa: 0.97; CI95%: 0.95-0.99; p value=0.0013), adjusted for five variables. Discussion: The majority of respondents had low back pain, being associated with more years of work, having previously had a work disability and age. This situation may be repeating itself in similar populations, so occupational health services should carry out evaluations and interventions to improve this reality.