The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) lists two chronic tic disorder diagnoses, namely, persistent motor or vocal tic disorder (PMVTD) and Tourette’s disorder (TD). Both disorders require symptom onset before age 18 years and require the clinician to rule out alternative causes of tics, including substance abuse and other medical conditions. Tics may be categorized as either simple or complex. Children with tic disorders may be most impaired by comorbid conditions and associated features, including deficient social skills, sleep problems, anxiety and/or depression, obsessive-compulsive disorder (OCD) symptoms, and attention deficit hyperactivity disorder (ADHD) symptoms. A review conducted in 2007 found that only two approaches—habit reversal therapy (HRT) and exposure and response prevention (ERP)-have adequate evidence to treat tic disorders and TD. Tourette’s disorder and other chronic tic disorders are childhood-onset conditions characterized by sudden, involuntary movements or vocalizations.