Stereotypic movement disorder

A disorder of childhood involving repetitive, nonfunctional motor behavior (hand waving or head banging), that interferes with normal activities or results in bodily injury, and persists for four weeks or longer. The repetitive movements that are common with this disorder include thumb su...cking, nail biting, nose-picking, breath holding, bruxism, head banging, rocking/rhythmic movements, self-biting, self-hitting, picking at the skin, hand shaking, hand waving, and mouthing of objects. Stereotypic movement disorder is often misdiagnosed as tics or Tourette's. Unlike the tics of Tourette's, which tend to appear around age six or seven, repetitive movements typically start before age two, are more bilateral than tics, and consist of intense patterns of movement for longer runs than tics.

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