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Tourette's tends to run in families. Other things that may increase the risk include:
A mother who had severe nausea and vomiting during the first trimester of pregnancy, was under severe stress during her pregnancy, or who drank a lot of coffee, smoked cigarettes, or drank alcohol during her pregnancy.
Not having enough oxygen or blood supply during birth.
A low birth weight and signs of brain injury or an enlarged section of the brain.