Tic Disorders and Tourette Syndrome

Tics are sudden, rapid, recurrent, non-rhythmic motor movements or vocalizations preceded by premonitory urge. Motor tics include eye blinking, head jerking, shoulder shrugging, and complex sequences. Vocal tics range from simple sniffing or grunting to complex echolalia and rare coprolalia. Tics wax and wane over weeks to months and worsen with stress or excitement.

Tourette syndrome diagnosis requires multiple motor and 1 or more vocal tics with onset before age 18 and duration over 1 year. Persistent motor or vocal tic disorder has only one tic type. Provisional tic disorder lasts under 1 year. Comorbid ADHD (60 percent), OCD (50 percent), anxiety, and learning disabilities significantly impact quality of life.

Comprehensive Behavioral Intervention for Tics (CBIT) including habit reversal training is first-line treatment with effect comparable to medications. Patients identify premonitory urge and perform competing response. Pharmacotherapy with alpha-2 agonists (clonidine, guanfacine), VMAT2 inhibitors (deutetrabenazine), or atypical antipsychotics reserved for severe impairment. Deep brain stimulation for refractory adult cases.