The most misdiagnosed disorder there is probably. It is so misdiagnosed that certain kids have to put up with the accusation of having it for a long time. While ADHD (hyperactive) has been diagnosed, acknowledged, and recognized in the brain of patients ADD is something that is seen as a lower form of that especially by the general public. The truth is there's no such thing. If you don't have ADHD then you don't have ADD. People come to quick conclusions to accuse kids of having it when they're really just lazy or so sheltered and protected that they'd rather have fun then work hard. Since it makes big $ companies don't care. The weirdest thing claimed about the disorder is that video games are made for people with ADD. How can some1 concentrate on the video game if they had ADD (if it existed)? The medicines used to treat ADHD or the supposed ADD are believed to stunt growth as well.
Sister: You're distracted easily. You're looking at the dog again. I think you have ADD.
Me: NO! I don't! I'm just lazy! OK! I admit it! Happy?! The dog is bothering me again. That's all. How could I spend hours playing and paying attention to a video game if I had ADD! How could I pay attention to a lecture or read a book? How can I still be talking to you and paying attention to what you say?!
Sister: Well you admit you have something right?
Me: Yeah... (whispers) maybe. But ADD doesn't exist. ADHD does but not ADD.
Sister: You're being overprotective. Maybe you just don't want to admit it.
Me: No I just get annoyed about being accused of having ADD all the time.