Autism is characterised by high comorbidity. It is most often accompanied by:

  • anxiety disorders;
  • mood disorders
  • sleep disorders;
  • ADHD (attention deficit hyperactivity disorder).

Autism spectrum disorder can also co-occur with neurological conditions such as:

  • epilepsy;
  • Landau-Kleffner syndrome;
  • syndromes with continuous slow-wave sleep discharges.

It is not uncommon for autistics to also suffer from phenylketonuria and food allergies.

It is estimated that 70-80% of autistic people have additional psychiatric problems. Approximately 40-50% of adolescents and adults with ASD meet criteria for two or more disorders. Accompanying psychiatric problems are one of the causes of behavioural disorders, especially in the form of aggression, self-aggression or oppositional behaviour. It is not uncommon for them to be the reason for the patient’s and their family’s first (pre ASD diagnosis) contact with a specialist.