The report analyzes the issues of risk of decreasing physical and mental health of adolescents and their Assessment. The research situation in which the rapid development of Internet technologies outpaces the research protocol and methods of psychological diagnostics being developed by scientists to study an objective picture of adolescents' functioning and development in the digital environment are discusses. The negative effects of the impact of the digital environment on the developing personality is a special group of research tasks. Internet overuse refers to excessive time spent online at the expense of other things as a behavioral addiction according to DSM-5 is currently considered a direct threat to the psychological well-being of adolescents. PsychoDiagnostic Tools and/or some scales of techniques of Russian and foreign authors, traditionally used for diagnostics of various aspects of Internet addiction (from time of Internet usage to pathological symptoms of addiction). We used15 Internet addiction test as an empirical material for overview more typically criteria’s of Internet addiction. On the basis of the analysis the informativeness of PsychoDiagnostic tools in terms of subordination of the most probable, posing a threat to mental and physical health is shown. The most actual symptoms/criteria’s of Internet addiction are:1) social isolation; 2) emotional problems (depression, anxiety, irritability, etc.); 3) depression / apathy; 4) lack of self-regulation; 5) loss of control over their own behavior.
The study results can help create a heuristic model for the study of Internet addiction of adolescents, taking into account the research tasks, age of respondents, environmental and individual-psychological factors. The pragmatic significance of the results is also the possibility of their use in the design psychological programs to address teen's Internet use.