Tweens who spend more time on screens have a higher likelihood of developing disruptive behavior disorders, with social media having an especially strong influence, a new UC San Francisco-led study ...

Oppositional defiant disorder (ODD) is a disruptive behavior disorder that emerges during childhood or adolescence and is characterized by persistent angry or irritable mood, unruly and argumentative ...

Before Oscar* got kicked out of his first preschool, he was upset about lunch. Not long into the school year, the 4-year-old expressed his displeasure with the midday meal by dousing his tray with ...