“I struggle with focusing on tasks but somehow manage to get things done right before the deadline.” Statements like this are often heard from individuals with high-functioning ADHD, although this does not imply that everyone who says this has ADHD. Individuals with high-functioning ADHD are usually able to meet the requirements of everyday life while still struggling with inattention and hyperactivity. An individual who fully meets the criteria for ADHD but is still able to function relatively well may be described as having high-functioning ADHD (HF-ADHD), with some symptoms being severe and others falling towards the milder end of the diagnostic spectrum. Both presentations may still be significantly impairing relative to an individual’s potential, although the less visibly impaired individual may not appear to be struggling to an outside observer (Torralva, Gleichgerrcht, Lischinsky, Roca, & Manes, 2013). Although HF-ADHD is not a formal diagnosis, existing literature acknowledges patterns of symptoms consistent with this presentation.
Executive Functioning and Self-Regulation
Barkley (2015) views ADHD primarily as a disorder of executive functioning and self-regulation. It involves difficulty consistently controlling attention, motivation, impulses, emotions, and behaviour in pursuit of future goals. The issue is often not a lack of knowledge about what to do, but an inability to reliably do it at the necessary time.
Existing Literature
Palmini et al. (2008) conducted research on professionally successful individuals with ADHD. The main reported symptoms included difficulties with attention, a tendency to procrastinate and “shuffle” priorities, excessive daytime sleepiness, memory difficulties, and impulsiveness. Their compensatory strategies involved conscious, energy-demanding, and time-consuming efforts to control or work around symptomatic behavioural tendencies.
Millioni et al. (2014) evaluated and compared the performance of adults with ADHD and either high or standard IQ on executive-function tasks. Adults with ADHD and higher IQ showed less evidence of executive-function deficits than those with ADHD and standard IQ. This suggests that greater intellectual efficiency may compensate for some executive-function difficulties, potentially making an accurate clinical diagnosis more difficult.
Critique of the Rigidity of Existing Diagnostic Frameworks
According to de Melo et al. (2026), previous literature has criticised the child-centred and male-centred biases embedded in existing diagnostic frameworks, but less attention has been given to their sign-centred and impairment-centred orientation. The authors argue that this emphasis creates a critical diagnostic blind spot for adults who maintain high academic, occupational, or social performance through compensatory strategies and masking while experiencing substantial internal distress.
For these individuals, impairment is not absent but concealed beneath sustained effort, perfectionistic overcompensation, and chronic self-monitoring. The resulting psychological burden—including emotional exhaustion, anxiety, shame, cognitive fatigue, and diminished quality of life—often remains invisible within behaviour-based diagnostic systems. Experiences such as mind-wandering, internal restlessness, time blindness, sensory over-responsivity, and effortful self-regulation may be clinically meaningful but remain insufficiently represented in formal criteria. Moreover, compensatory mechanisms and masking, despite their relevance to clinical presentation and diagnostic accuracy, are not systematically assessed.
Conclusion
High-functioning ADHD may be more common than is generally recognised, and the absence of a formal diagnostic category may prevent some individuals from receiving appropriate support. This highlights the need for greater flexibility in assessment and for interventions to be adapted according to an individual’s level of functioning, symptom severity, internal distress, and compensatory effort.