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Differential Diagnosis

Some conditions may have symptoms similar to autism; therefore, professionals must be diligent when determining a diagnosis and its treatment.

Following is a list of related syndromes/disorders that manifest behaviors similar to those of autism and/or are more prevalent in individuals with autism:

  • Cornelia deLange Sydrome: Cornelia deLange Syndrome Foundation
  • Tourette’s Syndrome: Tourette’s Syndrome Association
  • Fragile X Syndrome: The National Fragile X Foundation
  • Williams Syndrome: The Williams Syndrome Association
  • Down Syndrome: National Down Syndrome Society
  • Tuberous Sclerosis: Tuberous Sclerosis Alliance
  • Landau-Kleffner Syndrome: National Institute on Deafness and other Communication Disorders
  • Congenital Rubella Syndrome: Helen Keller National Center for Deaf-Blind Youths and Adults
  • Untreated Phenylketonuria (PKU): Children’s PKU Network
  • Kluver-Bucy Syndrome: National Institute of Neurological Disorders and Stroke
  • Prader-Willi Syndrome: Prader-Willi Syndrome Association
  • Lesch-Nyhan Syndrome: Lesch-Nyhan Disease Registry
  • Rett Syndrome:

Although autism is commonly thought of as a mental health disorder, it is a whole-body condition, which can manifest through a number of physical symptoms and characteristics.