Introduction: Internet addiction disorder (IAD) is characterized by an individual's inability to control his/her Internet use, which may result in marked distress and functional impairment. Systematic reviews show that excessive screen-time is negatively associated with well-being and positively associated with reduced quality of life in young people. There is growing evidence that IAD is related to comorbidities such as depression but relatively little is known about fatigue in adolescents with IAD. Material and methods: We studied 94 participants with IAD and 88 controls, all aged 12-17 years. Depression was assessed by the Beck depression inventory scale (BDI-II, Georgian version), and fatigue by the pediatric quality of life initiative (PEDS QL, Georgian version) multidimensional fatigue scale. Results: Adolescents with severe IAD are 5.63 times more likely to show symptoms of moderate or severe depression than children with mild or moderate Internet addiction. Those with severe IAD showed 6.62 times more cognitive fatigue, 7.81 times higher sleep/rest fatigue and 11.11 times higher general fatigue than children with mild and moderate Internet addiction. Conclusions: IAD can lead to depression and fatigue, which can affect adolescents' psychological and social wellbeing. Mechanisms for prevention and ongoing support are needed for adolescents and their families. Further research is needed to clarify the relationship between IAD and depression, that is, does Internet addiction lead to depression or is depression itself a risk factor for IAD? A further limitation is that IAD was treated as one entity rather than two distinct types (generalized and specific IAD).

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