Autism Spectrum disorders (ASD) is also known as autism spectrum conditions
(ASC) or the autism spectrum.  The autism spectrum is a variety of
psychological abnormalities in social interactions and communication. It may
also be displayed as severely restricted interests and exceedingly repetitive
behavior. Autism is one of the five autism spectrum disorders.
These disorders are very common in the pediatric population. Recent studies show
that as many as 3.4 in every 1000 children had autism. When the diagnosis is
made early on, the sooner treatment interventions can begin. Many children
however, are misdiagnosed and remain undiagnosed until after kindergarten.
Children with autism spectrum disorders show signs of problems with social
interaction, communication and repetition. Children may also display signs of
sensory issues and trouble with certain noises. They may be found covering their
ears or responding to everyday noises differently from others would. Each child
will present problems differently so each case needs to be treated individually.
Patterns of development for children with these disorders are often different.
   
Babies are very social individuals from early on in life. Children on the
spectrum have difficulty with human interaction and oftentimes prefer to be
alone. Children with ASD are usually interpret more slowly what others are
thinking and feeling. Social cues like smiling or winking have little meaning
and the social world may seem bewildering. Many believe that children on the
spectrum do not display affection as much either.  This is a controversial
issue and depends on the child involved as well as the extent to which they
present problems.
Some common problems associated with autism sensory disorders are sensory
problems, seizure, fragile X syndrome, mental retardation and tuberous
sclerosis. Diagnosing problems early on are critical to optimizing care. If
during a "well child" check-up a doctor sees any indication, further evaluation
is warranted.

Autism Causes, Symptoms and Treatments: http://autismnva.cjb.net/