RESUMO
BACKGROUND: Alcohol intake has been widely reported as a risk factor for low back pain (LBP), however, the literature is inconclusive about this association. OBJECTIVES: To determine, in a systematic review, the relationship between alcohol intake and LBP. METHODS: A search was conducted in CINAHL, LILACS, Medline, National Research Register and Web of Science to identify studies that investigated the association between alcohol intake and LBP. Quantitative results and its estimators were extracted. When possible, meta-analyses were performed using a random effects model. RESULTS: Twenty-six studies were included in this review. Twenty-three studies were retrospective cohorts, two were case-controls, and one employed a longitudinal design. Pooled results from nine studies (two case-controls and seven retrospective cohorts) showed that alcohol consumption is slightly associated with LBP (OR: 1.3; 95% CI: 1.1-1.5). This association appears to be present in studies investigating alcohol as an abuse dependence substance in chronic LBP. Remaining individual studies tended to report no statistical significant association. No dose-response relationship was identified. Only one longitudinal study was identified and even though alcohol consumption was found to be negatively associated with a future episode of LBP (OR: 0.7; 95% CI: 0.5-0.9) this association lost significance for future incidence of LBP in people with no LBP at baseline. CONCLUSIONS: Alcohol consumption appears to be associated with complex and chronic LBP only and in people with alcohol consumption dependence. Clinicians in the musculoskeletal field could use this information to design educational strategies for this population.
