Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier
WebMD

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine
WebMD

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion
    WebMD

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community
    WebMD

    Community

    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Autism Spectrum Disorders Health Center

Font Size
A
A
A

History of Autism

What Are the Types of Autism?

Over time, psychiatrists have developed a systematic way of describing autism and related conditions. All of these conditions are placed within a group of conditions called pervasive developmental disorders (PDD). Within PDDs, the autism spectrum disorder (ASD) category includes the following:

Autistic disorder: Children with autistic disorder cannot use verbal or nonverbal communication to interact effectively with others. Usually, children with autistic disorder have severe delays in learning language. They may have obsessive interest in certain objects or information. They may perform certain behaviors repeatedly. To be diagnosed with autistic disorder, symptoms must have been noted before age 3.

Pervasive developmental disorder, not otherwise specified (PDD-NOS): Children diagnosed with "atypical autism" are included in this group. Children with PDD-NOS have symptoms that do not exactly fit those of autistic disorder or any other ASD. For example, the symptoms may have developed after age 3. Or the symptoms may not be severe enough to be considered an autistic disorder.

Asperger's syndrome: Children with Asperger's syndrome may display many of the same symptoms as children with autistic disorder. However, they usually have average or above-average intelligence and initially show normal development of language. They often want to be social with others, but don’t know how to go about it. They may not be able to understand others' emotions. They may not read facial expressions or body language well. Their symptoms may not become apparent until school, when behavior and communication with peers become more important.

Other conditions share symptoms with PDDs and ASDs. These conditions include the following:

Rett syndrome: Children with this severe, rare condition begin with normal development from birth through about 5 months of age. However, from about 5 to 48 months of age, head circumference development slows. Children lose motor skills and social interaction and language development become impaired. Rett syndrome affects girls exclusively.

Childhood disintegrative disorder: Like Rett syndrome, children begin developing normally. However, from about age 2 to 10, children are increasingly less able to interact and communicate with others. At the same time, they develop repetitive movements and obsessive behaviors and interests. They lose motor skills, too. This usually leads to them becoming disabled. This autism-like condition is the rarest and most severe in autism spectrum disorder.

Today on WebMD

girl at window
Symptoms within the first 2 years of a child’s life.
boy playing a violin
How is this condition similar to autism?
 
Mother and daughter indoors playing
Play therapy may undo the disorder in at-risk babies.
preschool age girl sitting at desk
What causes this rare form of autism?
 
High Functioning Autism And Asperge Syndrome
Article
Gluten Free Diet Slideshow
Article
 
Mother and daughter indoors playing
Article
man on bicycle
VIDEO
 
girl at window
Article
Mother hugging teenage son
Article
 
Understanding Rett Syndrome
Article
Home Care Tips
Article
 

WebMD Special Sections