Ronaldson A, Elton L, Jayakumar S, et al. - Via performing this systematic review and meta-analysis, researchers examined the specific influence of severe mental illness (SMI) on the utilization of inpatient, emergency, and primary care services for nonpsychiatric medical disorders. Searching PubMed, Web of Science, PsychINFO, EMBASE, and The Cochrane Library, they identified 74 eligible studies (all observational cohort or case-control studies) for inclusion in this review. The studies involved participants ranging from 27 to 10,777,210. The majority of studies (n = 45) were of good quality. Narrative synthesis and random-effects meta-analyses demonstrated the correlation of having SMI with raised utilisation of all health services included as outcomes in the review. Illustrating and computing this helps to create a case for and guide the delivery of system-wide integration of mental and physical health services.