you know there is a medically diagnosed disorder that affects over two American children?” Experts on the subject say there are many more undiscovered cases out there and the cause is still unknown. It sounds like we have a really big problem. The thing is, the disorder that affects all these children, isn’t a disorder at all. Attention-deficit/hyperactivity disorder is a set of behaviors that are considered a medical problem. In reality, it isn’t a disorder. It is a fad that somehow got started.