ADHD appears to be highly heritable, although one-fifth of all cases are caused by trauma or exposure to toxins. Evidence suggests that ADHD is a heterogeneous disorder, meaning that several causes could create very similar symptomology. Although there is evidence for dopamine abnormalities in ADHD, it is not clear whether abnormalities of the dopamine system are a molecular abnormality of ADHD or a secondary consequence of ADHD.
Attention-deficit hyperactivity disorder pathophysiology
Autism pathophysiology
Asperger syndrome pathophysiology
Anhedonia pathophysiology
Conditions comorbid to autism spectrum disorders
Personality disorder pathophysiology
Mental retardation pathophysiology
Amnesia pathophysiology