ADHD has been considered a childhood condition; however,
more than 50% of children and teenagers with ADHD keep the diagnose until adulthood.
It may be difficult to diagnose because most symptoms disappear or lose strength (especially hyperactive symptoms). Attention difficulties are more evident while trying to complete work tasks and responsibilities.
Diagnosis can also be difficult because adults may present other psychiatric pathologies (comorbidity) that could interfere in the ADHD diagnosis. Pathologies may be related to substance abuse, anxiety or mood disorders, etc.