ADHD (Attention-Deficit/Hyperactivity Disorder)

ADHD is a neurodevelopmental disorder — a condition that begins in the developmental period, usually before a child starts grade school — marked by persistent patterns of inattention, hyperactivity, and impulsivity that are stronger than what is typical for the child's age and that interfere with functioning at home, at school, and with friends.

The three presentations

DSM-5 divides ADHD into three presentations:

• Predominantly inattentive — the "daydreamer" profile: trouble sustaining focus, organizing tasks, following through, remembering instructions and belongings
• Predominantly hyperactive/impulsive — constant motion and talking, difficulty waiting, acting without thinking
• Combined — significant features of both

DSM-5 also includes "other specified" and "unspecified" categories for children whose picture doesn't fit neatly, and the older ICD-10 system calls the condition "hyperkinetic disorder." A child's presentation can shift with age — a very hyperactive preschooler may grow into a mostly inattentive teen.

Executive function: the core challenge

ADHD is best understood as a disorder of executive function — the brain's management system. The skills most affected:

• Working memory — holding information in mind long enough to use it (like remembering a phone number while dialing it)
• Sequencing and prioritizing — knowing what to do first, next, and last
• Inhibiting — stopping an impulse before acting on it
• Sustaining attention — staying with a task when it isn't inherently interesting

One practical consequence parents notice: children with ADHD often struggle to transfer what they've learned from one setting to another. A skill mastered at home may seem to vanish at school, which is why support has to be coordinated across settings and kept up for a long time.

What ADHD looks like at school age

• Difficulty sitting still, waiting turns, or playing quietly
• Homework started but not finished; books and materials lost or forgotten
• Careless mistakes on work the child actually knows
• Appearing not to listen when spoken to directly
• Trouble organizing materials, time, and multi-step tasks
• Emotional reactions that seem outsized for the trigger

Critically: none of this is laziness, defiance, or bad parenting. It is a brain-based difference in self-regulation — a point researchers stress when describing related learning disorders, where a child's wrong answers are "not because they aren't focusing or not trying hard enough."

Overlap with autism and other conditions

ADHD and autism spectrum disorder are both neurodevelopmental disorders, and the sources emphasize that neurodevelopmental disorders frequently co-occur. Autistic children commonly show hyperactivity, impulsivity, and short attention span as part of the autism picture, which can complicate diagnosis; many children with ADHD also have a specific learning disorder (reading, writing, or math). Anxiety is another frequent companion.

Treatment: the big picture

Behavior therapy is recommended as the first-line treatment for children with ADHD under age five, and many experts advise starting with it for all children — among other reasons, because children who also need medication can often manage on a smaller dose when behavioral strategies are in place. Most school-age children do best with a combination of approaches: behavioral strategies at home and school, medication where appropriate, and healthy supports like exercise and sleep.

Not medical advice. This is a plain-language summary for orientation. Diagnosis and treatment decisions for ADHD belong with your pediatrician or a developmental/child mental-health specialist.