[Page 1876]Although it is not yet officially recognized as a diagnosable disorder by the American Psychiatric Association, Internet gaming disorder is included in Section III for further study in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). This is important, as there is increasing evidence that people of all ages, especially teens and preteens, are facing very real, sometimes severe consequences associated with compulsive use of video and online games. This entry describes the signs of the disorder included in the DSM-5, the consequences and national health concerns of the problem, what makes gaming addictive, and treatment strategies.