• Ana Paula Carvalho-E-Silva, Alison R Harmer, Manuela L Ferreira, and Paulo H Ferreira.
• Musculoskeletal Health Research Group, Faculty of Medicine and Health, School of Health Sciences, The University of Sydney, Sydney, NSW, Australia.
• Eur J Pain. 2021 Jul 1; 25 (6): 1264-1273.

BackgroundAlthough there is growing evidence of metformin's pleiotropic effects, including possible effects on pain, there is a lack of studies investigating the association of metformin with the prevalence of musculoskeletal pain among a large cohort with type 2 diabetes cohort.MethodsCross-sectional analyses were conducted with UK Biobank data from 21,889 participants with type 2 diabetes. Type 2 diabetes, metformin use and musculoskeletal (back, knee, hip and neck/shoulder) pain were self-reported. Participants reported musculoskeletal pain that had interfered with their usual activities in the last month (recent pain), and for more than 3 months (chronic pain). We performed logistic regression analyses for recent and chronic pain for each site and for multisite pain among participants with diabetes who did or did not take metformin.ResultsParticipants using metformin had lower odds of musculoskeletal pain for back [recent OR 0.91, 95%CI 0.85 to 0.97; chronic OR 0.87, 95%CI 0.81 to 0.93], knee [recent OR 0.91, 95%CI 0.85 to 0.97; chronic OR 0.87, 95%CI 0.81 to 0.94] and neck/shoulder regions [chronic OR 0.92, 95%CI 0.85 to 0.99] but not hip pain. Participants using metformin also had lower odds of reporting chronic multisite musculoskeletal pain. The associations were generally stronger among women.ConclusionsPeople with diabetes taking metformin were less likely to report back, knee, neck/shoulder and multisite musculoskeletal pain than those not taking metformin. Therefore, when treating these patients, clinicians should be aware that metformin may contribute to fewer reports of musculoskeletal pain. These effects should be investigated in future studies.SignificancePeople with type 2 diabetes taking metformin are less likely to present with musculoskeletal pain than those not taking metformin. Metformin may have a protective effect for musculoskeletal pain, which appears to be stronger among women than men.© 2021 European Pain Federation - EFIC®.

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