Nobody can empathize with the pain of a mother having an autistic child. Autism is a neural disorder; impaired social interaction and communication is the main symptom of autism. The signs of this disorder become prominent even before a child attains the age of three.
There are different opinions about the reason of autism. It is true that to treat autism, one has to understand the reason, however, the causes of this disorder are not fully understood yet. A lot of researchers believe that it has a genetic basis. At the same time, environmental changes, pollution, improper childhood vaccination, pesticides etc. are also thought to be the cause of autism.
Since it is a neurological and psychological disorder, presence of parents would help an autistic child more than medicines or any autism treatment. You can always consult a doctor to know how to treat autism, but the best medicine is YOU and the constant support that you give to your child. You may search the net for extensive information regarding autism treatment.