|People playing video games|
|Symptoms||Gaming taking priority over other interests and activities|
|Differential diagnosis||Bipolar disorder|
Gaming disorder is a diagnosis characterized by the uncontrollable and persistent playing of video and computer games, which is harmful to an individual's well-being. Many mental health professionals believe these games can cause a distinct type of addiction by triggering reward-motivated behavior, which releases dopamine and triggers the reward centers of the brain. Such disorders can be diagnosed when an individual engages in gaming activities at the cost of fulfilling daily responsibilities or pursuing other interests, and without regard for the negative consequences.
Not all medical and psychology experts agree on whether addictive gaming behaviors should be classified as a disorder. In the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), published by the American Psychiatric Association in 2013, "Internet Gaming Disorder" is defined as a "condition warranting more clinical research and experience before it might be considered in the main book as a formal disorder."
However, in 2018, the World Health Organization (WHO) included gaming disorder alongside gambling disorder under "Disorders Due to Addictive Behaviors" in its diagnostic International Classification of Diseases. For gaming disorder to be diagnosed, the behavior pattern must be of sufficient severity to result in significant impairment in personal, family, social, educational, occupational or other important areas of functioning and would normally have been evident for at least 12 months. Research shows gaming disorders can be associated with anxiety, depression, obesity, sleeping disorders, and stress. Which are just normal symptoms of Addiction.
The WHO's action has been criticized by some researchers who claim the evidence remains weak and "there is a genuine risk of abuse of diagnoses."
One issue with defining a gaming disorder and determining the legitimacy of the disorder is that there are no universally accepted measurement of video game addiction. This leads to issues properly identifying gaming disorder and confusion between it and other addictions. 
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