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ADHD: Signs, Diagnosis, and Support
Guidance on ADHD — what it is and is not, how diagnosis works in children and adults, and what support actually looks like.
- Sources Shown
- Evidence Based
- Patient Focused
ADHD is a neurodevelopmental condition involving persistent patterns of inattention, hyperactivity and impulsivity, or both, that interfere with functioning or development. Diagnosis requires several symptoms present before age 12, symptoms in two or more settings, and clear impact on daily life. The DSM-5 describes three presentations — predominantly inattentive, predominantly hyperactive-impulsive, and combined — replacing the earlier subtypes, because the pattern a person shows can change over time rather than being fixed. Since 2013, ADHD can also be diagnosed alongside autism, which the previous manual didn't permit. Support combines behavioral approaches, school accommodations, and where appropriate medication, with the recommended approach differing substantially by age.
What ADHD is
ADHD affects the brain's systems for regulating attention, activity, and impulse.
Two symptom domains:
Inattention — difficulty sustaining attention, careless mistakes, not seeming to listen, not following through, difficulty organizing, avoiding tasks requiring sustained mental effort, losing things, distractibility, forgetfulness.
Hyperactivity and impulsivity — fidgeting, leaving a seat, running or climbing inappropriately, difficulty playing quietly, being "on the go," talking excessively, blurting out answers, difficulty waiting, interrupting.
What the diagnosis requires:
- Several symptoms present before age 12
- Symptoms in two or more settings — home, school, work, with friends
- Clear evidence they reduce the quality of social, academic, or occupational functioning
- Symptoms not better explained by another condition
Six symptoms in a domain for children; five for those aged 17 and over.
What ADHD isn't
Not a failure of discipline or parenting. ADHD is neurodevelopmental. Parenting affects how well a child manages it; it doesn't cause it.
Not an absence of attention. People with ADHD can concentrate intensely on things that engage them — the difficulty is regulating where attention goes and sustaining it on things that don't. That inconsistency is characteristic, not evidence a person could do it if they chose.
Not only hyperactive boys. The predominantly inattentive presentation, which involves no visible hyperactivity, is routinely missed — particularly in girls, and particularly in children who are quiet and compliant.
Not outgrown reliably. Research informing the DSM-5 found ADHD does not fade at a specific age. Presentation changes; the condition often persists.
Diagnosis
Who — a pediatrician, child psychiatrist, or psychologist.
What's involved — developmental and family history, standardized rating scales from parents and teachers, direct assessment, and screening for co-occurring conditions.
The AAP recommends screening for coexisting conditions including anxiety, depression, oppositional defiant disorder, conduct disorder, substance use, learning and language disorders, autism, tics, and sleep apnea.
That last one is worth raising specifically. Poor sleep in children presents as hyperactivity and inattention rather than as tiredness. If your child snores, mouth breathes, or you've noticed pauses in their breathing, say so during assessment. → Nighttime drooling and mouth breathing
Also worth ruling in or out: hearing, sensory processing differences, and learning differences. Each can produce inattention that looks like ADHD, and each can co-occur with it.
ADHD and autism can be diagnosed together
Before 2013, they couldn't. The DSM-IV listed pervasive developmental disorder as an exclusion for ADHD — a clinician could give one or the other, not both.
The DSM-5 removed that exclusion, because the symptoms genuinely co-occur. Research indicates substantial overlap between the two.
Why this matters practically: if your child was assessed before 2013, or by a clinician working from older assumptions, one diagnosis may have precluded looking for the other. Both are now recognized together, and each affects what support helps.
→ Autism · Monotropism, which offers a way of understanding how attention distribution affects both
Support
Recommended approaches differ substantially by age. For children aged four to six, behavioral treatment comes first — before medication is considered.
Related topics
Areas that overlap with ADHD, and the ones most often confused with it.
Sensory processing
Considerable overlap with ADHD, and the two are regularly mistaken for one another.
Learn more →Autism
Since 2013 the two can be diagnosed together, and frequently are.
Learn more →Executive function
Planning, working memory and getting started — the skills behind most of what is hard.
Learn more →Behavior and emotions
When the behavior is the presenting problem and ADHD is underneath it.
Learn more →Frequently Asked Questions
Does ADHD go away?
Research informing the DSM-5 found ADHD does not fade at a specific age. How it presents commonly changes — visible hyperactivity often reduces while inattention and executive difficulties persist.
Is ADHD overdiagnosed?
It's debated, and diagnosis rates have risen. It's also underdiagnosed in some groups — particularly girls and children with the inattentive presentation, who don't show the visible hyperactivity that prompts referral.
At what age does ADHD start?
Symptoms must be present before age 12 for diagnosis. The DSM-5 raised this from age 7 after research found no clinical differences between children identified earlier versus later.
What are the three types of ADHD?
The DSM-5 describes three presentations rather than types: predominantly inattentive, predominantly hyperactive-impulsive, and combined. The change from "subtype" was deliberate — the pattern can change over time in the same person.
Can a child have ADHD and autism?
Yes. The DSM-5 removed the exclusion that previously prevented both being diagnosed together, because the two frequently co-occur.
What should be ruled out before an ADHD diagnosis?
The AAP recommends screening for anxiety, depression, oppositional defiant disorder, conduct disorder, substance use, learning and language disorders, autism, tics, and sleep apnea. Hearing and sensory processing are also worth raising.
Therapy for ADHD
What each discipline actually does — assessment, what sessions look like, and what the evidence supports.
- Occupational therapy for ADHD — daily activities, fine motor skills, and sensory processing
- Speech therapy for ADHD — communication, feeding, and swallowing
- Physical therapy for ADHD — movement, strength, balance, and mobility
Sources
- American Psychiatric Association — What Is ADHD? and DSM-5-TR (2022); Highlights of Changes from DSM-IV to DSM-5, ADHD. psychiatry.org
- Wolraich ML, et al. (2019). Clinical Practice Guideline for the Diagnosis, Evaluation, and Treatment of Attention-Deficit/Hyperactivity Disorder in Children and Adolescents. Pediatrics 144(4):e20192528. publications.aap.org
Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment, and it does not include medication dosing. Assessment for ADHD should be carried out by a qualified professional.