autism causes and symptoms
Signs and Symptoms. According to the Autism Society, autism symptoms typically become clearly evident during early childhood, between 24 months and 6 years of age. Symptoms include a marked delay in language and cognitive development. There may be signs of obsessive and/or antisocial behavior.
Autism spectrum disorder - Causes. Causes of autism spectrum disorder. The exact cause of autism spectrum disorder (ASD) is currently unknown. It's a complex condition and may occur as a result of genetic predisposition (a natural tendency), environmental or unknown factors. Genes.