The following result is obtained by Internet Research Algorithm:
Autism is not a single condition but it is a spectrum of disorder that ranges. The great difficulty in conversation, eye contact, feeling awkward and getting nervous, can't speak, rocking, can't express feelings, can't communicate, can't show love or hate and express it by hurting self are some of the conditions and deficits are seen in children having autism. Autism contains a wide range of conditions, not particular.
Autism is a spectrum of etiologies, having a spectrum of causes like advance paternal age, if a mother exposes to some harmful agent while the fetal brain is developing and genes also can be the reason.