Autism and autism spectrum disorders are complex neurodevelopmental disorders. Many<unk>  of autism have been proposed, but its theory of causation is still incomplete. Heritability contributes about 90% of the risk of a child developing autism, but the genetics of autism are complex and typically it is unclear which genes are responsible. In rare<unk> , autism is strongly associated with agents that<unk> birth defects. Many other<unk>  have been proposed, such as exposure of children to vaccines; these proposals are controversial and the vaccine hypotheses have no convincing scientific evidence.
Autism causes
Mental retardation causes
Causes of autism
Schizophrenia causes
Mental retardation pathophysiology
Hearing impairment risk factors
Mental retardation risk factors
Delirium causes