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Attention Deficit Hyperactivity Disorder — Grokipedia Fact-checked by Grok 12 days ago Attention Deficit Hyperactivity Disorder Ara Eve Leo Sal 1x Synonyms ADHD ADD hyperkinetic disorder Specialty Psychiatry Classification neurodevelopmental disorder Subtypes Predominantly inattentive presentation Predominantly hyperactive-impulsive presentation Combined presentation Symptoms persistent patterns of inattention and/or hyperactivity-impulsivity that interfere with functioning or development; inattention symptoms include failure to attend to details, difficulty sustaining attention, not listening when spoken to, non-follow-through on instructions, organizational challenges, avoidance of sustained mental effort, losing items, distractibility, forgetfulness; hyperactivity-impulsivity symptoms include fidgeting, leaving seat, running/climbing inappropriately, inability to engage in quiet activities, being 'on the go', excessive talking, blurting out answers, difficulty awaiting turn, intruding on others Onset early childhood (before age 12) Duration persistent patterns lasting more than six months; persistence into adulthood observed in a subset of individuals Causes high heritability (70-80% from twin studies), polygenic structure, associations with dopaminergic pathways, small associations with certain prenatal environmental factors Risk Factors familial aggregation, certain prenatal factors Diagnostic Method clinical assessment using informant reports (e.g., parent, teacher), rating scales, clinician interpretation of frequency, severity, and impairment across multiple settings Diagnostic Criteria DSM-5: at least six symptoms (five for individuals aged 17 or older) in inattention and/or hyperactivity-impulsivity domains, persisting more than six months, onset before age 12, occurring in multiple settings, causing significant impairment, not better explained by other disorders Dsm 5 DSM-5 designation for ADHD; key changes include age-of-onset criterion modified from 7 to 12 years and broadened symptom descriptors Icd 10 F90 (Hyperkinetic disorders); commonly F90.9 Attention-deficit hyperactivity disorder, unspecified Differential Diagnosis normative developmental variation, other disorders that could primarily explain symptoms Treatment stimulant medications, behavioral and psychosocial interventions Medication stimulants such as methylphenidate (influencing catecholaminergic signaling) Prognosis long-term outcomes vary; persistence into adulthood in a subset; methodological heterogeneity and attrition limit conclusions about sustained efficacy and adverse effects Prevalence approximately 11% of children aged 3-17 in the United States; substantial variability in international comparisons Gender Ratio higher rates among boys than girls Complications Anxiety disorders depression oppositional defiant disorder conduct disorder autism spectrum disorder learning disabilities substance use disorders increased risk of accidents, injuries, and suicide First Description 1902 by Sir George Frederic Still Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder in major diagnostic systems, including the DSM-5/DSM-5-TR and ICD-11. [1] [2] This classification indicates that core difficulties in attention and/or activity-impulse regulation typically emerge in the developmental period, involve atypical patterns, and can impair functioning. [3] It does not specify a single biological cause, brain lesion, or prognosis. [2] ADHD diagnosis relies on behavioral symptoms and functional impairment, without a definitive laboratory test or biomarker. [4] It involves developmental history, input from multiple informants (e.g., parents, teachers, individuals), standardized rating scales, and clinical judgment on whether behaviors exceed developmental norms, occur across settings, and cause impairment. [5] DSM-5 requires a persistent pattern of inattention and/or hyperactivity-impulsivity for at least six months, with symptoms before age 12 and impairment in social, academic, or occupational domains. [1] Diagnosis incorporates contextual and cultural factors: norms, language, and expectations from families, schools, or workplaces influence how behaviors are expressed, observed, and assessed. [6] Thus, similar presentations may warrant diagnosis in one setting but not another, varying by evaluator and context. [7] Diagnostic systems differ (e.g., ICD-10 hyperkinetic disorders vs. ICD-11 ADHD), affecting comparisons across time and regions. [8] In the U.S., 2022 parent surveys estimated 11.4% of children aged 3–17 had ever received an ADHD diagnosis, varying by age and sex; international figures differ by definitions, methods, and care access. [9] Family and twin studies show strong genetic influences on ADHD risk, alongside non-genetic factors; neuroimaging reveals small average differences but is not diagnostic. [10] [11] Treatments include psychoeducation, behavioral interventions, and stimulants when appropriate; meta-analyses confirm short-term symptom relief, with long-term outcomes varying by study factors. [12] Clinical Presentation Core Symptoms and Subtypes Attention-deficit/hyperactivity disorder (ADHD) is defined in DSM-5 as a persistent pattern of inattention and/or hyperactivity–impulsivity that interferes with functioning or development. [5] Diagnosis requires at least six symptoms (five for ages 17+) present for six months, starting before age 12, in two or more settings, causing impairment, and not attributable to another disorder. Without biological markers, it relies on behavioral evidence from history, multi-informant reports, and clinician judgment of frequency, pervasiveness, and impact. [5] Inattention symptoms include careless mistakes, difficulty sustaining attention, not listening, disorganization, avoiding effortful tasks, losing items, distractibility, and forgetfulness. Hyperactivity–impulsivity symptoms encompass fidgeting, leaving seats, excessive running or climbing, inability to play quietly, constant motion, excessive talking, blurting answers, trouble waiting, and interrupting. These symptoms lack specificity to ADHD, appearing in typical development or other conditions, so diagnosis depends on severity, persistence, and impairment. [5] Symptom criteria differ between DSM and ICD systems and evolve across DSM editions; DSM-5 shifted from subtypes to presentations, influencing research on symptom patterns. [13] DSM-5 defines three presentations—predominantly inattentive, predominantly hyperactive–impulsive, and combined—to capture fluctuations over time, as hyperactivity often decreases with age, reflecting current profiles rather than fixed traits. [13] ADHD Presentations (DSM-5) Presentation Symptom Requirements Common Characteristics and Notes Combined Presentation At least 6 inattention and 6 hyperactivity-impulsivity symptoms Most frequent in children; may persist into adulthood Predominantly Inattentive Presentation At least 6 inattention, fewer than 6 hyperactivity-impulsivity More common in adults and females; often involves daydreaming, disorganization Predominantly Hyperactive/Impulsive Presentation At least 6 hyperactivity-impulsivity, fewer than 6 inattention More prominent in preschool/young children; decreases with age Prevalence of presentations varies by age: combined is most common in childhood, while inattentive becomes more prevalent in adulthood. Sources: DSM-5 criteria; epidemiological studies. DSM-5 -aligned rating scales aid consistent assessment but do not uniquely identify ADHD or link to a single biological cause. [14] [5] Variations Across Age Groups ADHD diagnostic patterns vary by age due to developmental contexts, expectations, and practices, not a uniform progression. Behaviors like inattention and impulsivity occur population-wide, with shifts reflecting how they exceed thresholds at different life stages. [1] [15] Childhood Patterns Childhood ADHD often involves elevated motor activity, impulsivity, and attention difficulties in structured settings, common across children. Preschoolers may exhibit loud speech, poor volume control, hoarseness, breathiness, and vocal strain linked to impulsivity. [16] U.S. prevalence for ages 3–17 is 7–11%, varying by informant and method. Trajectories are heterogeneous: some remit, others persist or fluctuate with demands and context. [17] [18] [19] [20] [21] Adolescent Patterns Adolescence shows group-level motor activity declines, with rises in organizational, effort, and emotion regulation issues amid greater demands. Childhood-to-adolescence persistence is 40–60%, higher in retrospective reports. Risk-taking, anxiety, and depression increase non-specifically. In girls around age 14, inattentive presentations prevail, with internalized symptoms like daydreaming, disorganization, forgetfulness, internal restlessness, and emotional vulnerabilities; underdiagnosis stems from less disruption than in boys. Puberty and pressures may exacerbate these, risking comorbidity. [22] [23] [24] [25] [26] [27] [28] Adult Patterns Adults often report concentration, organization, completion, and time management difficulties, overlapping with stress, mood issues, and mismatches—not ADHD-specific. Prevalence is 2.5–4%, varying internationally. Prospective studies show lower childhood-to-adulthood persistence than retrospective ones; impairments tie to demands and comorbidities. [29] [30] [31] [32] [24] [25] [33] [34] Overall Characterization Age variations highlight behavioral heterogeneity shaped by development, demands, assessments, and comorbidities, not a singular biological sequence. Interpretations must account for normative changes and variability. Associated Behavioral and Cognitive Features ADHD, defined behaviorally, yields "associated features" from comparisons of diagnosed or high-symptom groups to controls. "People with ADHD" denotes those meeting specific criteria in context; operational differences affect group composition