Gunnar Engström focuses on Internal medicine, Cardiology, Incidence, Cohort and Risk factor. His primary areas of investigation include Internal medicine, Incidence, Stroke, Risk factor and Endocrinology. The study incorporates disciplines such as Diabetes mellitus, Surgery and Cardiology in addition to Internal medicine. His work carried out in the field of Incidence brings together such families of science as Relative risk, Physical therapy and Metabolic syndrome. His Internal medicine study combines topics in areas such as Endocrinology and Surgery. He studied Endocrinology and Odds ratio that intersect with Case-control study and Single-nucleotide polymorphism.

His Cardiology study integrates concerns from other disciplines, such as Spirometry and Blood pressure. His Incidence research integrates issues from Epidemiology, Cohort study, Heart failure, Relative risk and Quartile. The concepts of his Cohort study are interwoven with issues in Body mass index and Gastroenterology.