Charles Raison : To untangle the mystery of teenagers ' tics , try to make the symptoms make sense . It causes very similar symptoms . Tourette 's syndrome can be ruled out , since it 's a rare and solitary disorder , he says . But other disorders like ADHD are more likely to have an underlying cause that is not mental illness ( e.g. autism ) or genetic predisposition ( for example schizophrenia ). Raison : That leaves psychological cause as most reasonable explanation .
Charles Raison : To untangle the mystery of teenagers ' tics , try to make the symptoms make sense . Tourette 's syndrome can be ruled out , since it 's a rare and solitary disorder , he says . But other disorders like ADHD are more likely to have an underlying cause that is not mental illness ( e.g. autism ) or genetic predisposition ( for example schizophrenia ). Raison : That leaves psychological cause as most reasonable explanation .