ADHD originates from differences in brain structure and neurochemistry, particularly in regions responsible for executive function. Research shows that the prefrontal cortex, which governs attention, planning, and impulse control, develops differently in individuals with ADHD, with studies indicating approximately 3-5% smaller volume in key regulatory areas compared to neurotypical adults.
These structural differences lead to dysregulation of dopamine and norepinephrine, two neurotransmitters essential for sustaining attention and motivation. When these chemical messengers are not produced or recycled efficiently, the brain struggles to filter distractions, prioritize tasks, and maintain the consistent focus required for complex activities.
ADHD is among the most heritable psychiatric conditions, with genetic factors accounting for approximately 74% of the variance in symptoms. Multiple genes involved in dopamine receptor sensitivity and neurotransmitter transport contribute to the condition, which is why ADHD frequently runs in families and often persists from childhood into adulthood.
