The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) criteria has included internet gaming disorder (IGD) as a condition, but it needs further research. Little is known about who is at risk of developing IGD. Efforts at prevention and early intervention are very important in childhood and adolescence when the first signs of IGD appear, especially in susceptible groups. However, in the results of studies investigating the relationship between psychopathologies and IGD, there are contradictions that may be the result of heterogeneity in the evaluation processes. Therefore, it is critical to use DSM-5 criteria or questionnaires regarding IGD. Ninety-two children were included in this study, which is a cross-sectional study evaluating the correlation between IGD and other possible comorbid conditions (inattention, hyperactivity/impulsivity, oppositional defiant disorder, conduct disorder, anxiety, depression, suicidality, and family dysfunction). IGD scores were significantly correlated with the scores of anxiety, hyperactivity/impulsivity, and suicidal ideation. However, we did not find a significant correlation between IGD and depression or family dysfunction. The mean time between the first internet gaming experience and the parents' recognition of the disorder was about 2 years. Children suffering from anxiety or hyperactivity/impulsivity should be evaluated for their screen time. Children with problematic gaming behavior are at risk for developing suicidal tendencies.