What's the difference between ADD and ADHD? | Child Mind Institute

Attention-deficit hyperactivity disorder, or ADHD, is a condition that makes it unusually difficult for children to concentrate, to pay attention, to sit still, to follow directions, and to control impulsive behavior. While all young children are at times distractible, restless, and oblivious to parents’ and teachers’ instructions, kids with ADHD behave this way much more often than other children their age. And their inability to settle down, focus, and follow through on tasks in age-appropriate ways makes it very hard for them to do what’s expected of them at school. It can also lead to conflict at home and difficulty getting along with peers.
It was called ADD up until 1987, when the word “hyperactivity” was added to the name.
Before that, say in 1980, a child would be diagnosed with ADD, either with or without hyperactivity. But starting in the early 1990s, that child would be diagnosed with ADHD.
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