It is really confusing, isn't it? It used to be that psychiatrist used the terms ADD and ADHD but when they updated the DSM (Diagnostic and Statistical Manual of Mental Disorders) they changed it to everybody with ADD/ADHD is now called ADHD but now it is ADHD with hyperactivity or ADHD without hyperactivity. I don't know why doctors keep renaming things. I find it most annoying. When I first studied as a RN diabetes was either IDDM (insulin dependent diabetes mellitus) or NIDDM (non-insulin dependent diabetes mellitus). That made sense to me. But now they don't use those term and say it is either Diabetes Type ! or Diabetes Type 2. And my knee problem used to be called chondromalacia but now it is patellofemoral syndrome.
I certainly am rambling on. Can you tell I have ADHD too? (without the hyperactivity)
When my son was young he was very, VERY hyperactive. Ran everywhere, would eat his dinner twisting and lying sideways and at times under the table. He was a handful to keep up with. But when he became a teenager he became less hyperactive. He still has attention problems but no hyperactivity. So which classification would he be in then? Would it change from childhood to teen years or should his diagnosis remain the same? I haven't got a clue.