Psychiatric disorder	Features shared with ADHD	Distinctive features
Major depression	Subjective report of poor concentration, attention and memory; difficulty with task completion	Enduring dysphoric mood or anhedonia; sleep and appetite disturbance
Bipolar disorder	Hyperactivity, difficulty with maintaining attention and focus; mood swings	Enduring dysphoric or euphoric mood; insomnia; delusions
Generalized anxiety	Fidgetiness; difficulty concentrating	Exaggerated apprehension and worry; somatic symptoms of anxiety
Substance abuse or dependence	Difficulties with attention, concentration and memory; mood swings	Pathologic pattern of substance use with social consequences; physiologic and psychologic tolerance and withdrawal
Personality disorders, particularly borderline and antisocial personality	Impulsivity; affective lability	Arrest history (antisocial personality); repeated self-injurious or suicidal behavior (borderline personality); lack of recognition that behavior is self-defeating