The prevalence of comorbid neurobehavioral problems in 35 children and adolescents (31 [88%] boys; mean age 11.8 years) with Tourette syndrome (TS) was determined at a psychiatric clinic at Shiraz University of Medical Sciences, Hafez Hospital, Iran. Motor tics were blinking (54%), mouth (31%) and shoulder (31%) movements. Vocal tics were throat clearing and grunting. Coprolalia occurred in 9%. Comorbid disruptive behavior disorders were ADHD in 24 (68%); ODD (28%); and CD in 5.7%. TS+disruptive behaviors occurred in 71%, TS+anxiety disorders in 43% (OCD 26%), TS+mood disorders in 14%. TS patients without comorbidity were uncommon (2.9%), and less than previously reported. 
COMMENT. Almost all patients with TS have some behavioral comorbid disorder. ADHD is the most common comorbid disorder, followed by ODD and OCD. Mood disorders are uncommon.