A video game addiction can be harmful if your child is unable or unwilling to participate in any interests or extracurricular activities other than gaming. The On-Line Gamers Anonymous website notes that it may be a sign of an addiction if your child is constantly thinking about his next video game session, devising ways to get back to the game, abandoning former hobbies that don’t relate to video games or declining social events with personal interaction because he's spending time discussing video games on the Internet.