RT Journal Article SR Electronic T1 Association of adverse childhood experiences with the development of multiple sclerosis JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 645 OP 650 DO 10.1136/jnnp-2021-328700 VO 93 IS 6 A1 Eid, Karine A1 Torkildsen, Øivind A1 Aarseth, Jan A1 Aalstad, Mari A1 Bhan, Alok A1 Celius, Elisabeth G A1 Cortese, Marianna A1 Daltveit, Anne Kjersti A1 Holmøy, Trygve A1 Myhr, Kjell-Morten A1 Riise, Trond A1 Schüler, Stephan A1 Torkildsen, Cecilie F A1 Wergeland, Stig A1 Gilhus, Nils Erik A1 Bjørk, Marte-Helene YR 2022 UL http://jnnp.bmj.com/content/93/6/645.abstract AB Objective To study whether exposure to childhood emotional, sexual or physical abuse is associated with subsequent multiple sclerosis (MS) development.Methods A nationwide, prospective cohort study based on participants in the Norwegian Mother, Father and Child cohort study. Enrolment took place 1999–2008, with follow-up until 31 December 2018. Childhood abuse before age 18 years was obtained from self-completed questionnaires. We identified MS diagnoses through data-linkage with national health registries and hospital records. The Cox model was used to estimate HRs for MS with 95% CIs, adjusting for confounders and mediators.Results In this prospective cohort study, 14 477 women were exposed to childhood abuse and 63 520 were unexposed. 300 women developed MS during the follow-up period. 71 of these (24%) reported a history of childhood abuse, compared with 14 406 of 77 697 (19%) women that did not develop MS. Sexual abuse (HR 1.65, 95% CI 1.13 to 2.39) and emotional abuse (HR 1.40, 95% CI 1.03 to 1.90) in childhood were both associated with an increased risk of developing MS. The HR of MS after exposure to physical abuse was 1.31 (95% CI 0.83 to 2.06). The risk of MS was further increased if exposed to two (HR 1.66, 95% CI 1.04 to 2.67) or all three abuse categories (HR 1.93, 95% CI 1.02 to 3.67).Interpretation Childhood sexual and emotional abuse were associated with an increased risk of developing MS. The risk was higher when exposed to several abuse categories, indicating a dose–response relationship. Further studies are needed to identify underlying mechanisms.Data may be obtained from a third party and are not publicly available. Enquiries regarding access to data from MoBa and the MBRN can be directed to the Norwegian Institute of Public Health. Data from the MSR are accessible for researchers by application (http://norskmsregister.no).