Pervasive Development Disorders

• What conditions are considered pervasive development disorders (PDDs)?
• Autism
• Asperger's syndrome
• Childhood disintegrative disorder
• Rett's syndrome
• Pervasive development disorder not otherwise specified (PDDNOS)
• What are the symptoms of pervasive development disorders?
• What causes pervasive development disorders?
• How common are pervasive development disorders?
• How are pervasive development disorders diagnosed?
• How are pervasive development disorders treated?
• What research is being done on pervasive development disorders?
• What is the outlook for people with pervasive development disorders?

The term "pervasive development disorders" (PDDs) refers to a group of conditions that involve delays in the development of many basic skills, most notably the ability to socialize with others, to communicate and to use imagination. Children with these conditions often are confused in their thinking and generally have problems understanding the world around them.

Because these conditions typically are identified in children around 3 years of age—a critical period in a child's development—they are called development disorders. Although the condition begins far earlier than 3 years of age, parents often do not notice a problem until the child is a toddler who is not walking, talking or developing as well as other children of the same age.

What Conditions Are Considered Pervasive Development Disorders?

There are five types of PDDs:

• Autism: Children with autism have problems with social interaction, pretend play and communication. They also have a limited range of activities and interests. Many (nearly 75%) of children with autism also have some degree of mental retardation.



• Asperger's syndrome: Like children with autism, children with Asperger's syndrome have difficulty with social interaction and communication, and have a narrow range of interests. However, children with Asperger's have average or above average intelligence, and develop normally in the areas of language and cognition (the mental processes related to thinking and learning). Children with Asperger's often also have difficulty concentrating and may have poor coordination.



• Childhood disintegrative disorder: Children with this rare condition begin their development normally in all areas, physical and mental. At some point, usually between 2 and 10 years of age, a child with this illness loses many of the skills he or she has developed. In addition to the loss of social and language skills, a child with disintegrative disorder may lose control of other functions, including bowel and bladder control.



• Rett's syndrome: Children with this very rare disorder have the symptoms associated with a PDD and also suffer problems with physical development. They generally suffer the loss of many motor or movement, skills—such as walking and use of their hands—and develop poor coordination. This condition has been linked to a defect on the X chromosome, so it almost always affects girls.



• Pervasive development disorder not otherwise specified (PDDNOS): This category is used to refer to children who have significant problems with communication and play, and some difficulty interacting with others, but are too social to be considered autistic.

Suggested Reading by Our Doctors

• Detecting Hearing Loss in Children - Read about tests used for identifying hearing loss in children, treatment information, causes, risk factors and signs of hearing impairment, and learn about degrees of hearing loss.
• Autism - Learn about the 3 symptoms associated with autism: impairment in social interaction, communication, and behavior. Causes, signs, diagnosis, and treatment information is also included in the autism spectrum disorders information.
• Asperger Syndrome - Learn about Asperger syndrome characteristics such as limited interests, repetitive routines, speech and language peculiarities, social and emotional inappropriate behavior, and more.

Read more Pervasive Development Disorders related articles »

Latest Medical News

• Swine Flu Poses Risk to Kids With Neurological Conditions