What ADHD actually is

ADHD is a neurodevelopmental condition, described in the clinical literature as a persistent pattern of inattention and/or hyperactivity-impulsivity that starts early, shows up across more than one setting, and gets in the way of everyday functioning. It is not a modern invention, a phase, or a shortage of discipline.

The clearest way to think about it is as a difficulty with self-regulation rather than a lack of knowing what to do. Russell Barkley's work frames ADHD as a problem of performance, not of knowledge — people usually know exactly what should happen and struggle to get their own behaviour to follow at the moment it matters. That is why advice like "just try harder" lands so badly.

Attention is not simply absent. It is unevenly allocated. The same person who cannot start a tax form may work on something interesting for six straight hours. Clinicians call this variable regulation; from the inside it feels like having an engine with no reliable gearbox.

Two clarifications worth holding on to. First, ADHD continues into adulthood for a large share of people, though how it looks changes — visible restlessness often becomes internal restlessness, procrastination, or a scattered sense of overwhelm. Second, nothing in this course can diagnose anyone, including you. Only a qualified clinician can do that, after a proper history. This course is here so you understand it well enough to be useful — to yourself or to someone you work with.