Brain Scans Reveal Three Distinct ADHD Subtypes, Including Severe Form

For generations, ADHD has been understood as a single condition wearing different masks — inattentive, hyperactive, or both — but new neuroimaging research suggests the disorder is not one thing at all. Scientists have identified three distinct subtypes, each with its own biological signature in the brain, including one that appears markedly more severe than the others. This discovery invites medicine to reconsider not just how ADHD is treated, but what it fundamentally is — a question with profound consequences for the millions who live inside its diagnosis.