Oppositional defiant disorder (ODD) is a behavior disorder where a child is prone to temper tantrums, disregards rules, and is habitually angry, hostile, or vindictive toward peers and adults. The exact cause of the disorder is unknown, but it could stem from biological factors or issues with the child’s social environment or emotional attachment. Boys are more likely to have ODD, and some risk factors include having a mood disorder or attention-deficit/hyperactivity disorder (ADHD). In some cases, ODD symptoms decrease as the child ages, but it’s also possible for the condition to develop into conduct disorder or antisocial personality disorder.