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NIMH
nimh.nih.gov › health › topics › attention-deficit-hyperactivity-disorder-adhd
Attention-Deficit/Hyperactivity Disorder (ADHD) - National Institute of Mental Health (NIMH)
For many people with ADHD, symptoms cause problems in daily life. Symptoms can make it hard to get things done; interfere with school, work, or other activities; and strain social relationships. Children with ADHD are at increased risk for injuries, social problems, family stress, and poor grades.
neurodevelopmental disorder
Illustration representing an ADHD brain.
Neuropsychiatric Disorders and Epigenetics
The science behind Adderall
Epigenetics in Psychiatry
Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterised by symptoms of inattention, hyperactivity, impulsivity, and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and developmentally inappropriate. Wikipedia
Factsheet
Other names Attention-deficit/hyperactivity disorder
Formerly: Attention deficit disorder (ADD), hyperkinetic disorder
Factsheet
Other names Attention-deficit/hyperactivity disorder
Formerly: Attention deficit disorder (ADD), hyperkinetic disorder
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Wikipedia
en.wikipedia.org › wiki › Attention_deficit_hyperactivity_disorder
Attention deficit hyperactivity disorder - Wikipedia
5 days ago - Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterised by symptoms of inattention, hyperactivity, impulsivity, and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and developmentally inappropriate.
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CDC
cdc.gov › adhd › about › index.html
ADHD in Children | Attention-Deficit / Hyperactivity Disorder (ADHD) | CDC
July 30, 2026 - Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders of childhood.
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MedlinePlus
medlineplus.gov › home › health topics
Attention Deficit Hyperactivity Disorder | ADHD | ADD | MedlinePlus
ADHD is a neurodevelopmental disorder. It is usually first diagnosed in childhood and often lasts into adulthood. But some people don't get diagnosed with ADHD until they are adults.
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Medscape
emedicine.medscape.com › tools & reference › psychiatry
Adult Attention-Deficit/Hyperactivity Disorder (ADHD): Background, Diagnostic Criteria, Epidemiology
3 weeks ago - Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder characterized by persistent patterns of inattention, hyperactivity, and impulsivity that impair functioning across multiple settings.
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American Psychiatric Association
psychiatry.org › patients-families › adhd › what-is-adhd
Psychiatry.org - What is ADHD?
ADHD is considered a chronic and debilitating disorder and is known to impact the individual in many aspects of their life including academic and professional achievements, interpersonal relationships, and daily functioning (Harpin, 2005). ADHD can lead to poor self-esteem and impaired academic and social function in children when not appropriately managed (Harpin et al., 2016).
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Harvard Health
health.harvard.edu › mind-and-mood › attention-deficit-hyperactivity-disorder-adhd-a-to-z
Attention-Deficit Hyperactivity Disorder (ADHD) - Harvard Health
October 15, 2024 - What is ADHD? Attention deficit hyperactivity disorder (ADHD), usually first diagnosed in childhood, can appear in a variety of forms and has many possible causes. People with ADHD probably have an underlying genetic vulnerability to developing ...
Find elsewhere
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Mayo Clinic
mayoclinic.org › diseases-conditions › adult-adhd › symptoms-causes › syc-20350878
Adult attention-deficit/hyperactivity disorder (ADHD) - Symptoms and causes - Mayo Clinic
January 25, 2023 - This mental health disorder includes a combination of persistent problems, such as difficulty paying attention, hyperactivity and impulsive behavior.
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CHADD
chadd.org › home › for adults › overview
Overview - CHADD
April 6, 2026 - Approximately 15.5 million adults have been diagnosed with attention-deficit/hyperactivity disorder (ADHD). In early adulthood, ADHD may be associated with depression, mood or conduct disorders and substance abuse. Adults with ADHD often cope with difficulties at work and in their personal and family lives related to ADHD symptoms.
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YouTube
youtube.com › watch
What Is ADHD? | Ask Cleveland Clinic’s Expert - YouTube
For more information about ADHD, please visit https://cle.clinic/44CHZjmAttention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder, whi...
Published: June 30, 2025
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CDC
cdc.gov › adhd › index.html
Attention-Deficit / Hyperactivity Disorder (ADHD) | CDC
July 8, 2026 - Read about ADHD, its types, symptoms, possible risk factors, screening, treatment, and CDC's work.
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Cleveland Clinic
my.clevelandclinic.org › health › diseases › 4784-attention-deficithyperactivity-disorder-adhd
Attention-Deficit/Hyperactivity Disorder (ADHD)
ADHD stands for attention-deficit/hyperactivity disorder. It’s a neurodevelopmental disorder, which means it affects how your brain develops. Symptoms begin before age 12 and include fidgeting, difficulty paying attention and losing things.
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AACAP
aacap.org › aacap › Families_and_Youth › Resource_Centers › ADHD_Resource_Center › Home.aspx
ADHD Resource Center
Attention Deficit/Hyperactivity Disorder (ADHD) is a condition which includes difficulties with attention, increased activity, and difficulties with impulsivity.
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NIMH
nimh.nih.gov › health › publications › attention-deficit-hyperactivity-disorder-what-you-need-to-know
Attention-Deficit/Hyperactivity Disorder: What You Need to Know - National Institute of Mental Health (NIMH)
Attention-deficit/hyperactivity disorder (ADHD) is a developmental disorder marked by persistent symptoms of inattention, hyperactivity, and impulsivity. Some people mostly have symptoms of inattention.
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Mayo Clinic
mayoclinic.org › diseases-conditions › adhd › symptoms-causes › syc-20350889
Attention-deficit/hyperactivity disorder (ADHD) in children - Symptoms and causes - Mayo Clinic
March 7, 2025 - This condition affects children and may continue into adulthood. It can include having a hard time paying attention, being hyperactive and being impulsive.
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ADHD UK
adhduk.co.uk › home › about adhd
What is ADHD - About ADHD
What is ADHD? It is a disorder that is defined through analysis of behaviour. People with ADHD show a persistent pattern of inattention and/or hyperactivity–impulsivity that interferes with day-to-day functioning and/or development.
Published: June 26, 2026
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HealthDirect
healthdirect.gov.au › attention-deficit-disorder-add-or-adhd
Attention deficit hyperactivity disorder - ADHD symptoms, causes and diagnosis | healthdirect
May 18, 2026 - Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental (brain development) condition that begins in early childhood.
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CDC
cdc.gov › adhd › about › adhd-in-adults.html
ADHD in Adults | Attention-Deficit / Hyperactivity Disorder (ADHD) | CDC
1 month ago - ADHD symptoms can change over time and may look different at older ages. Hyperactivity, for example, may decrease or may appear as extreme restlessness. Symptoms may also become more severe when the demands of adulthood increase.
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Mental Health America
screening.mhanational.org › screening-tools › adhd
ADHD Test – Mental Health America
April 6, 2026 - Trouble focusing at school or at work? Our online ADHD test is free, quick, confidential, and scientifically validated for teens and adults.
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ADHD UK
adhduk.co.uk
ADHD UK - Homepage - ADHD UK
From there we have videos (by Dr Max Davie – specialist in ADHD, trustee of ADHD UK and person with ADHD), we have information on teacher attitudes to help inform conversations with your school, and for adults a self-screener survey to uncover if you might have ADHD.