s clinics, only a small minority have no other conditions, and obsessive–compulsive disorder
(OCD) and attention
-deficit hyperactivity disorder
(ADHD) are often present. In children with Tourette's, ADHD is associated with functional impairment, disruptive behavior, and tic severity. Other comorbid conditions include self-injurious behaviors (SIB), anxiety, depression, personality disorders, oppositional defiant disorder, and conduct disorders.