&gt; ADHD is defined in the DSM-IV and now -5 as presenting with predominantly hyperactive tendencies or with predominantly inattentive tendencies (or combined, presenting both).<p>This was a little unclear to me until I looked into the wikipedia page you linked a bit more[1].  To try to clarify in case others are in the same spot, ADHD has 3 primary &quot;sub-types:&quot;<p>* Predominantly inattentive, which is the form discussed in the original article.<p>* Predominantly hyperactive-impulsive, which most diagnosed boys exhibit.<p>* Combined (AKA both inattentive and hyperactive-impulsive)<p>I&#x27;m not sure if the most common case for young boys is only hyperactive or if it&#x27;s combined.  Either way, the symptoms of hyperactivity are most disruptive, so they are what causes most people to seek medical help.<p>[1]: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Attention_deficit_hyperactivity_disorder#Diagnostic_and_Statistical_Manual" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Attention_deficit_hyperactivit...</a>