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Tourette syndrome (TS) is a common genetic neurological disorder characterized by chronic motor and vocal tics beginning before adulthood. Affected individuals typically have repetitive, stereotyped movements or vocalizations, such as blinking, sniffing, facial movements, or tensing of the abdominal musculature.
Genetic Changes. A variety of genetic and environmental factors likely play a role in causing Tourette syndrome. Most of these factors are unknown, and researchers are studying risk factors before and after birth that may contribute to this complex disorder.