Source: No Attribution/PixabayAttention-deficit/hyperactivity disorder (ADHD) isn't just about symptoms you can see. Sure, a child with ADHD can be fidgety, or overly talkative, or unable to focus. Hiding underneath that, though, may be intense anxiety, too. Maybe their lack of impulse control goes so deep they can't even control their own thoughts. Then, after years of being punished more often than their siblings, or removed from classrooms day after day, they become angry and depressed.