Genetics. Several different genes appear to be involved in autism spectrum disorder. For some children, autism spectrum disorder can be associated with a genetic disorder, such as Rett syndrome or fragile X syndrome. For other children, genetic changes (mutations) may increase the risk of autism spectrum disorder.

What is the most likely cause of autism?

Genetics. Genetic factors may be the most significant cause for autism spectrum disorders. Early studies of twins had estimated heritability to be over 90%, meaning that genetics explains over 90% of whether a child will develop autism.

Does autism cure with age?

A new study found that some children correctly diagnosed with autism spectrum disorders (ASD) at an early age may lose symptoms as they grow older. Further research may help scientists understand this change and point the way to more effective interventions.

What age does autism usually start?

ASD begins before the age of 3 years and can last throughout a persons life, although symptoms may improve over time. Some children show ASD symptoms within the first 12 months of life. In others, symptoms may not show up until 24 months or later.