Smartphone use health outcomes in children and adolescents: A systematic review of behavioral, developmental, and environmental risk pathways

Figure 7 Conceptual overview of radiofrequency electromagnetic field exposure from smartphones in children. The figure illustrates the primary sources of pediatric radiofrequency electromagnetic field exposure, including mobile phones, Wi-Fi routers, and cellular base stations. During active smartphone use, radiofrequency electromagnetic field emissions are absorbed locally in cranial tissues, particularly when the device is held near the head. Proposed biological mechanisms include thermal effects and putative nonthermal cellular responses; however, current epidemiologic and experimental evidence in children does not demonstrate increased brain tumor risk, elevated overall cancer incidence, or consistent neurocognitive impairment at exposure levels within international safety standards. The diagram distinguishes theoretical biological mechanisms from the largely reassuring evidence base while emphasizing ongoing research and regulatory oversight. RF-EMF: Radiofrequency electromagnetic field.