Early Signs of Autism

By jolene
May 15, 2020
Medical Expert Medical Expert

2. Causes

Since the mechanism is unclear, the definitive cause of autism is also unknown. However, some factors that have been implicated include obstetric complications (exposure to certain medications during pregnancy); infection (rubella during pregnancy has been suggested); familial or genetic factors (rate of 18.7% if there is already a child with ASD and twin studies demonstrating a moderate degree of heritability with environment making a large contribution to the development of ASD); exposure to toxins, poisons, chemicals, or other substances (such as the high incidence of autism in some areas of Japan due to the toxic effect of some fish); and parental age (risk increases when either parent is 35 years old or older).


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