Stereotypic Movement Disorder

Criterion A

Repetitive, seemingly driven, and apparently purposeless motor behaviour (e.g., hand shaking or waving, body rocking, head banging, self-biting, hitting own body).

Criterion B

The repetitive motor behaviour interferes with social, academic, or other activities and may result in self-injury.

Criterion C

Onset is in the early developmental period.

Criterion D

The repetitive motor behaviour is not attributable to the physiological effects of a substance or neurological condition and is not better explained by another neurodevelopmental or mental disorder (e.g., trichotillomania, obsessive-compulsive disorder).

  • With self-injurious behaviour (or behaviour that would result in an injury if preventive measures were not used)
  • Without self-injurious behaviour
  • Associated with a known medical or genetic condition, neurodevelopmental disorder, or environmental factor (e.g., Lesch-Nyhan syndrome, intellectual disability, intrauterine alcohol exposure).