Autism is one of the forms of Pervasive Developmental Disorder (PDD) wherein an individual suffer from communication, there is speech problem, they do not interact with other people, and an uncontrollable behavior. Usually autism can be detected early in life before the age of three, when a child shows these kinds of symptoms there is a great possibility that he or she is autistic. Autism is hereditary, if one member in the family has this kind of illness; there is a great possibility that that individual or the siblings' offspring can have an autistic child. Currently, there is no cure for this kind of sickness but through proper care and education of the child; he or she can live normally.

             The major cause of autism is hereditary. They may be mild autism or severe autism. In mild autism, as the child grows he overcomes his disorders and soon he acts as normal. But for severe autism, it is a long-term illness and most of the time he will carry this kind of illness as long as he lives. There are some identified causes of autism according to Grossmann (2000):.

             "Identified causes for autism include several chromosomal abnormalities involving different "genetic sites." Fragile-x syndrome involves the x chromosome, Angelman's syndrome involves chromosome 15, and many other chromosomal abnormalities may present with "autism." Other disorders such as Touberouse sclerosis, a disorder causing skin and brain abnormalities and frequent severe epileptic seizures (chromosome 9 and 16) may present with "autism" also. Some "metabolic disorders" such as PKU (phenylketonuria), where a substance (phenylalanine) accumulates in the brain, and other disorders of metabolism may present with autism. .

             Another important condition that may cause "autism" is a form of a seizure disorder or Laundau Kleffner syndrome. This disorder, also known as acquired epileptiform aphasia, is a disorder in which seizures develop from the area responsible for speech (in the left hemisphere), "robbing" the child from acquiring language and is associated with an autistic regression.