Introduction: The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) defines depression as a persistent period of sadness or a reduced interest in everyday activities lasting at least two weeks. Anhedonia, a key symptom of depression, is notable for its significance and is regarded as the second most important factor related to non-somatic issues, following closely behind a depressed mood. This study primarily investigates how excessive or problematic use of Internet-connected devices affects the mood and emotions of young people, with a specific emphasis on anhedonia. Additionally, it explores associated socio-behavioral changes and examines the interaction between IA and depression. Methods: This systematic review was conducted following PRISMA international guidelines. Searches were performed in PubMed, Cochrane Library (Clinical Trials section), Scopus, Embase, PsycInfo, and grey literature sources like Google Scholar. A predefined search strategy using Boolean operators was employed, and two researchers independently selected papers, with a third researcher resolving any discrepancies. Manual reviews were conducted to minimize selection bias. Results: Out of 3812 records, 7 studies were included. The findings suggest that social anhedonia correlates with higher levels of IA, particularly among adolescents and young adults. In some studies, loneliness was identified as a mediator between social anhedonia and social functioning, indicating a complex interplay of emotional factors. Other investigations revealed that increased screen time is associated with a heightened risk of developing addiction-related behaviors. Practical Implications and Conclusions: This review highlights the key role of anhedonia in the development of Internet addiction (IA) among young people, particularly through its impact on emotional regulation and social interactions. Addressing psychological and environmental factors is essential for developing targeted strategies to prevent and manage IA and its related mental health challenges.
