Educational summary
Overview
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental condition involving persistent patterns of inattention, hyperactivity and impulsivity that affect everyday functioning.
Inattention describes difficulty sustaining attention, following through on tasks, organising activities and keeping track of everyday things. Hyperactivity and impulsivity describe restlessness, difficulty remaining still, and acting or speaking before it is one's turn. Some people mainly experience one grouping, some both.
Everyone is inattentive, restless or impulsive at times. What distinguishes ADHD is that the pattern is persistent, began in childhood, appears in more than one setting such as home and school or work, and interferes with daily functioning.
Attention in ADHD is not uniformly poor. Many people concentrate intensely on activities they find engaging while struggling with routine or repetitive tasks, which is why the condition is sometimes misread as a matter of motivation or effort.
Presentation changes with age. Visible hyperactivity often diminishes after childhood and becomes an internal sense of restlessness, while difficulties with organisation and sustained attention frequently continue into adulthood. ADHD is recognised in adults, including those not identified as children.
ADHD is treatable, and recognized approaches exist. This page is educational and is not intended to diagnose a mental health condition or replace evaluation by a qualified health professional.
References
- [1]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderWhat is ADHD?Supporting reference for the general educational overview.
- [2]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderDoes ADHD look the same in everyone?Supporting reference for the variation in presentation and its change with age.
Educational summary
Signs and Symptoms
ADHD is described through two symptom groupings. What follows describes patterns in general terms; it is not a checklist and is not used here to identify the condition in any individual.
Inattention may appear as difficulty holding attention on tasks, being drawn easily to unrelated sights, sounds or thoughts, trouble organising work and managing time, avoidance of activities requiring sustained mental effort, losing things needed for tasks, forgetting routine obligations, and appearing not to listen when spoken to directly.
Hyperactivity and impulsivity may appear as fidgeting, difficulty remaining seated, restlessness, talking a great deal, answering before a question is finished, difficulty waiting, and interrupting or intruding on others.
Presentations differ. Some people show mainly inattentive features, some mainly hyperactive and impulsive features, and many show both. The balance can change over time in the same person.
Age matters to how this looks. In children, hyperactivity is often visible as movement. In adolescents and adults it is more often described as an internal restlessness, difficulty relaxing, or a need to be occupied. Inattentive difficulties frequently become more prominent as demands for independent organisation increase.
Because these experiences are common in the general population, assessment considers how long the pattern has been present, whether it appears in more than one setting, how much it interferes with daily life, and whether another condition better explains it.
References
- [1]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderWhat are the symptoms of ADHD?Supporting reference for the described symptom groupings.
Educational summary
Causes and Risk Factors
No single cause of ADHD has been identified. It is understood as arising from a combination of factors that differ between individuals, and it is not caused by parenting, diet or personal effort.
Genetic factors are substantial. ADHD runs in families, and research consistently indicates a strong heritable component, though no single gene accounts for it.
Research also describes differences in the development and functioning of brain networks involved in attention, activity regulation and executive function, including the systems that support planning, working memory and inhibition. Development of these networks may follow a different timeline.
Several factors during pregnancy and early life are associated with increased likelihood, including very low birth weight, significant prematurity, and exposure to certain substances during pregnancy. Association is not the same as cause, and most people with such histories do not develop ADHD.
Popular explanations that lack support include sugar intake, screen time as a sole cause, and parenting style. Environment and circumstances can affect how much difficulty a person experiences, and what support helps, without being the origin of the condition.
Contributing factors are described here to aid understanding and are not used to determine whether any individual has ADHD.
References
- [1]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderWhat causes ADHD?Supporting reference for the contributing factors described.
Educational summary
Related and Co-occurring Conditions
ADHD frequently occurs alongside other conditions, and several conditions produce similar difficulties. Distinguishing between them is a clinical task and is described here only to aid understanding.
Anxiety conditions commonly co-occur. Concentration is affected in both, but in anxiety the difficulty usually accompanies worry, whereas in ADHD it is present independently of it.
Depressive difficulties are also common, particularly where longstanding struggles at school or work have affected confidence. Concentration and motivation are affected in depression too, though typically alongside low mood and loss of interest, and with a clearer point of onset.
Sleep problems deserve particular attention, because insufficient or disrupted sleep produces inattention, irritability and restlessness closely resembling ADHD, and can also occur as a result of it.
Learning difficulties, including those affecting reading or mathematics, often occur with ADHD and can look similar when a person struggles with schoolwork.
Autism and ADHD frequently co-occur, and current classification allows both to be recognised in the same person.
Thyroid conditions, hearing or vision problems, the effects of some medicines, and the aftermath of a significant life event can all affect attention, which is why assessment considers physical health and circumstances rather than behaviour alone.
References
- [1]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderGeneral supporting reference. No heading on the cited page covers co-occurring and related conditions specifically, so no locator is recorded.
Educational summary
Treatment
ADHD is treatable, and several approaches have recognized evidence. Which is appropriate depends on the individual, their age, the severity and pattern of difficulties, other health conditions, personal preference, and what is available locally. These decisions are made with a qualified health professional.
Medication is well established. Stimulant medicines are the most consistently identified pharmacological option; non-stimulant medicines are recognised alternatives where stimulants are unsuitable, not tolerated or ineffective. Stimulants are controlled medicines. Whether medication is appropriate, which type, at what dose and for how long are decisions for a prescribing clinician together with the person concerned and, for a child, their parents or carers. Treatment usually involves careful adjustment over time and monitoring of effects, including sleep, appetite, growth in children, and heart rate and blood pressure.
Behavioural and psychological approaches are also used. For younger children, structured programmes delivered through parents and carers are commonly recommended, often before medication is considered. For adolescents and adults, cognitive behavioural approaches focusing on planning, procrastination and the effects of longstanding difficulty are used.
Practical support matters and is often underestimated: organisational strategies, reminders, structured routines, and adjustments in education or employment such as changes to deadlines, task structure or environment.
Understanding the condition, for the person affected and for those around them, is commonly part of treatment. Approaches are usually combined and reviewed over time, and needs change with age and circumstances.
If difficulties are worsening, or distress feels unmanageable, contact a qualified health professional. If there is immediate risk of harm, see our crisis resources page for how to find urgent support.
MOMD does not provide individual treatment advice and does not recommend starting, stopping, or changing any medication.
References
- [1]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderHow is ADHD treated?Supporting reference for the treatment approaches described.
- [2]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderMedicationSupporting reference for the medication options described.
- [3]Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental HealthNational Institute of Mental Health - Attention-Deficit/Hyperactivity DisorderPsychotherapy and behavioral interventionsSupporting reference for the behavioural and psychological approaches described.
Associated features
Symptoms
Difficulty holding attention on tasks or activities, particularly those that are repetitive or not immediately engaging.
Sustained attention difficulty is one of the two symptom groupings that define the condition. It is typically most visible in tasks that are repetitive or offer little immediate interest, and may be absent in activities the person finds absorbing.
- Distractibilitycommon
Attention drawn easily to unrelated sights, sounds or thoughts, making it hard to return to what was being done.
Attention being drawn to competing stimuli is closely related to sustained attention difficulty and often accounts for unfinished tasks.
Trouble sequencing steps, managing time and materials, and completing tasks that have been started.
Organisational difficulty is central to how the condition affects work, study and home life, and is frequently what brings adults to seek assessment.
Frequently forgetting routine obligations such as appointments, chores, replies or belongings.
Everyday forgetfulness is common and is distinct from memory loss: the information is usually retained but not retrieved at the moment it is needed.
A persistent sense of physical restlessness, difficulty remaining seated, or continual movement of hands and feet. In adults this is often experienced inwardly rather than seen.
Hyperactivity is the second defining grouping. Its outward form typically changes with age, becoming an internal sense of restlessness in adolescence and adulthood rather than visible movement.
Acting or speaking before it is one's turn, finding waiting uncomfortable, or intruding into conversations and activities.
Impulsivity in this context concerns the timing of responses rather than recklessness, and is often what affects relationships most directly.
- Irritabilityassociated
Reduced tolerance for frustration, or becoming annoyed more easily than usual.
Frustration and irritability commonly accompany repeated difficulty completing tasks or meeting expectations.
- Sleep Disturbanceassociated
A meaningful change in usual sleep, which may include difficulty sleeping, disrupted sleep, waking unusually early, or sleeping substantially more than usual.
Difficulty settling at night and irregular sleep patterns are frequently reported.
- Impulsive or Risk-Taking Behaviourassociated
Decisions made with little regard for consequence, including around money, driving, work, or sexual behaviour.
Some people, particularly in adolescence and adulthood, act on impulses with less regard for consequences. This is an associated feature rather than a defining one.
Reference systems
Classifications
- System
- Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR)
- Classification
- Attention-Deficit/Hyperactivity Disorder
- Category
- Neurodevelopmental Disorders
- Source
- Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR)
- System
- International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)
- Classification
- Attention-deficit hyperactivity disorders
- Code
- F90
- Category
- Mental, Behavioral and Neurodevelopmental disorders
- Source
- International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)
Treatment reference
Treatments
- Stimulant Medicationmedication_class
A class of medicines commonly used in the treatment of ADHD. These are controlled medicines, prescribed, titrated and monitored by a qualified clinician.
Medication option, prescribed and monitored by a qualified clinician.
Stimulant medicines are the most consistently identified pharmacological option for ADHD in authoritative treatment guidance. They are controlled medicines and require clinical assessment, titration and monitoring.
- Non-Stimulant Medicationmedication_class
Medicines used in ADHD that do not belong to the stimulant class, sometimes chosen where stimulants are unsuitable, ineffective or not tolerated.
Medication option, prescribed and monitored by a qualified clinician.
Non-stimulant medicines are recognised alternatives where stimulants are unsuitable, not tolerated or ineffective. Choice is a clinical decision.
- Behavioural Parent Trainingbehavioral
Structured programmes that support parents and carers in responding consistently to behaviour, widely used where the person affected is a child.
Behavioural treatment option.
Behavioural interventions delivered through parents and carers are recognised in the treatment of ADHD in children, and are commonly recommended before medication for younger children.
- Cognitive Behavioral Therapypsychotherapy
A structured psychological therapy focused on relationships among thoughts, emotions, behaviors, and coping patterns.
Psychological treatment option.
Structured cognitive behavioural approaches are used, particularly with adolescents and adults, often focusing on planning, procrastination and the effects of longstanding difficulty.
- Organisational and Skills Supportsupportive
Practical approaches to planning, time management, reminders and task structuring, used alongside other treatment.
Supportive option.
Practical skills and organisational support are widely used alongside other treatment.
- Educational or Workplace Adjustmentssupportive
Adjustments to the demands of a classroom or workplace, such as changes to deadlines, seating, task structure or the environment.
Supportive option.
Adjustments in education and employment settings are commonly part of overall management.
- Psychoeducation and Relapse Planningsupportive
Structured education about the condition, recognising early warning signs, protecting sleep and routine, and planning ahead for periods of illness.
Supportive option.
Understanding the condition, for the person affected and for those around them, commonly accompanies other treatment.
Evidence & references
Sources
- Attention-Deficit/Hyperactivity Disorder: What You Need to KnowNational Institute of Mental Health