ADHD versus ASD

Attention-Deficit/Hyperactivity Disorder (ADHD) and Autism Spectrum Disorder (ASD) are neurodevelopmental conditions often diagnosed in childhood, yet they present distinct diagnostic criteria. ADHD is characterized by persistent patterns of inattention, hyperactivity, and impulsivity that impair functioning or development. Diagnostic criteria, as outlined in the DSM-5, include difficulty sustaining attention, forgetfulness, excessive fidgeting, interrupting others, and acting without thinking. These symptoms must be present before age 12 and occur in multiple settings.

ASD, on the other hand, is defined by deficits in social communication and interaction, coupled with restricted, repetitive patterns of behavior, interests, or activities. Social communication deficits can include challenges with social reciprocity, nonverbal communication, and developing and maintaining relationships. Repetitive behaviors might involve stereotyped movements, insistence on sameness, intense fixations, and sensory sensitivities. ASD symptoms must be present in early childhood, though they may not become fully manifest until social demands exceed limited capacities.

While both conditions can impact executive functions, the core features differ. ADHD primarily affects attention and impulse control, whereas ASD centers on social interaction and repetitive behaviors. Comorbidity is also common, meaning an individual can meet the diagnostic criteria for both ADHD and ASD, further complicating differential diagnosis.