Keywords used in the screening process.

BackgroundThe global mortality caused by non-communicable diseases is on the rise. Health-promoting lifestyles are among the most effective approaches, yet the physical activity domain consistently scores the lowest. Physical activity is linked to individual behaviour and influenced by numerous factors. Illness has been identified as a key factor in behavioural change. Therefore, the primary purpose of this review was to investigate the role of illness perception in the physical activity domain among patients with non-communicable disease.MethodThis systematic review follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2020 guidelines. A literature search was conducted across three scientific databases (Scopus, PubMed, and Web of Science), targeting original articles published in English between 2014 and 2024. The quality of the eligible articles was assessed using the Joanna Briggs Institute Critical Appraisal tools. The findings were synthesised through content analysis.ResultsA total of 17 studies were included, identifying both the direct and indirect effects of illness perception variables as a whole or in their respective dimensions. The illness perception variable has demonstrated a significant positive and negative relationships with the physical activity domain.LimitationThe majority of the included studies had a cross-sectional design. Therefore, the evidence quality was relatively low and exhibited a high risk of bias. Furthermore, there was language bias as only English-language publications were selected.ConclusionThe findings of this review will serve as a guide for healthcare providers in enhancing physical activity adherence among patients with non-communicable diseases through an illness perception approach. This approach can be integrated into clinic consultations and intervention programmes. Future studies are warranted to evaluate the effectiveness of the illness perception approach in promoting physical activity adherence.