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Tics & Tourette Syndrome

What Do You Need to Know?

Tics are sudden, rapid, recurrent, non-rhythmic movements or vocalizations preceded by a premonitory urge and are temporarily suppressible
Tourette syndrome: multiple motor tics + ≥1 vocal tic, onset <18 years, duration >1 year (DSM-5); male predominance 3–4:1
Tics wax and wane in severity, type, and location over time — this fluctuation is characteristic
Comorbidities often more disabling than tics: ADHD (50–60%), OCD (40–60%), anxiety, depression
CBIT is first-line behavioral treatment; alpha-2 agonists (guanfacine, clonidine) first-line pharmacologic
Antipsychotics (fluphenazine, aripiprazole, pimozide) for severe/refractory tics — monitor QTc with pimozide

Tic Classification

Definition & Key Features

Premonitory urge: uncomfortable sensory phenomenon preceding the tic (“itch” or “pressure”) — present in >90% of patients ≥10 years
Suppressibility: voluntarily suppressed for brief periods, but suppression builds urge (“rebound”)
Suggestibility: tics may increase when discussed or observed
Waxing and waning: severity fluctuates over weeks to months; types and locations change over time
Exacerbating: stress, fatigue, anxiety, excitement — Improving: focused concentration, sleep

Tic Types

Category	Description	Examples
Simple Motor	Brief, sudden, meaningless	Eye blinking (most common initial tic), facial grimacing, head jerking, shoulder shrugging
Complex Motor	Coordinated, purposeful-appearing	Touching objects, jumping, squatting, copropraxia (obscene gestures), echopraxia (imitating movements)
Simple Vocal	Meaningless sounds	Sniffing, throat clearing, grunting, barking, coughing
Complex Vocal	Linguistically meaningful	Coprolalia (obscene words — <20% of Tourette), echolalia (repeating others’ words), palilalia (repeating own words)

DSM-5 Tic Disorder Spectrum

Provisional tic disorder: Motor and/or vocal tics, duration <1 year, onset <18 years
Persistent (chronic) tic disorder: Motor OR vocal tics (not both), duration >1 year, onset <18 years
Tourette syndrome: Multiple motor tics + ≥1 vocal tic (not necessarily concurrent), duration >1 year, onset <18 years

💎 Board Pearl

Premonitory urge + suppressibility + waxing/waning = tics. The premonitory urge is the most distinguishing feature from other hyperkinetic movements.
Coprolalia occurs in <20% of Tourette patients — NOT required for diagnosis.
Eye blinking is the most common initial tic. Motor tics typically precede vocal tics by 1–2 years.

Tourette Syndrome

Epidemiology & Genetics

Prevalence: ~1% of school-age children; male:female = 3–4:1
Age of onset: typically 4–6 years; peak severity: 10–12 years
Natural history: ~2/3 improve by late adolescence; ~1/3 persist into adulthood; ~1/3 achieve complete remission
Genetics: Polygenic; MZ twin concordance 50–77%; SLITRK1 and HDC implicated in rare families

Pathophysiology

Cortico-striato-thalamo-cortical (CSTC) circuit dysfunction — disinhibition of motor and limbic circuits
Reduced caudate volume; dopamine hypothesis: hypersensitive striatal dopaminergic signaling — supported by response to D2 blockers

Diagnosis

Clinical diagnosis — no confirmatory lab or imaging required
DSM-5: Multiple motor + ≥1 vocal tic (need not be concurrent); >1 year duration; onset <18; not due to substance/medical condition
YGTSS (Yale Global Tic Severity Scale): Standardized rating of tic number, frequency, intensity, complexity, interference

Clinical Pearl

Motor and vocal tics do NOT need to occur simultaneously — both just need to have been present at some point during the illness.
Tic severity does not predict comorbidity severity — mild tics may coexist with severely disabling OCD or ADHD.

Comorbidities

Comorbidities are the rule rather than the exception and are often more disabling than the tics themselves.

Comorbidity	Prevalence	Key Points
ADHD	50–60%	Most common; often appears before tics; stimulants generally safe; guanfacine treats both
OCD	40–60%	“Just right” phenomena, symmetry, ordering > contamination; SSRIs + CBT first-line; may persist after tics remit
Anxiety	30–40%	Generalized, social, separation anxiety; exacerbates tics
Depression	20–25%	Primary or secondary to social stigma and functional impairment
Learning disabilities	20–30%	Often related to comorbid ADHD/executive dysfunction rather than tics per se
Rage attacks	25–70%	Explosive outbursts disproportionate to trigger; overlaps with ADHD impulsivity

💎 Board Pearl

Treat the most disabling condition first — often ADHD or OCD rather than tics.
Stimulants are NOT contraindicated in Tourette — methylphenidate may mildly/transiently worsen tics but is generally safe.
“Just right” OCD (symmetry, ordering) is more characteristic of Tourette-associated OCD than contamination-type.

Treatment

General Principles

Not all tics require treatment — treat only if functionally impairing, painful, or causing significant distress
Psychoeducation: Reassure about waxing/waning nature and likelihood of improvement with age

Behavioral Therapy (First-Line)

CBIT (Comprehensive Behavioral Intervention for Tics): Gold-standard; includes HRT + function-based interventions + relaxation
HRT (Habit Reversal Training): Awareness training (recognize premonitory urge) + competing response training (incompatible voluntary action)
Level A evidence; comparable efficacy to medications without side effects; effective in children ≥9 years and adults

Pharmacotherapy

Tier	Drug Class	Agents	Key Points
First-line	Alpha-2 agonists	Guanfacine, clonidine	Guanfacine preferred (less sedation); also treats ADHD; SE: sedation, hypotension
Second-line	Typical antipsychotics	Fluphenazine, pimozide, haloperidol	Most potent tic suppressors; pimozide → QTc prolongation (ECG monitoring); fluphenazine best tolerated
Second-line	Atypical antipsychotics	Aripiprazole, risperidone	Aripiprazole increasingly preferred (partial D2 agonist, favorable profile)
Adjuncts	Other	Topiramate, tetrabenazine	Topiramate has RCT support; tetrabenazine off-label for severe tics (risk of depression)
Focal tics	Botulinum toxin	OnabotulinumtoxinA	Focal motor or vocal tics; reduces both tic AND premonitory urge; repeat q3–4 months
Refractory	Deep brain stimulation	GPi or CM-Pf thalamus	Severe, treatment-refractory cases; emerging evidence

💎 Board Pearl

CBIT/HRT is first-line for tics (Level A evidence). Always offer behavioral therapy before or alongside medications.
Alpha-2 agonists (guanfacine > clonidine) are first-line pharmacotherapy — especially when comorbid ADHD is present.
Pimozide requires ECG monitoring for QTc prolongation — contraindicated with CYP3A4 inhibitors.
Botulinum toxin reduces both the tic AND the premonitory urge — unique dual benefit.

Secondary Tics

PANDAS / PANS

PANDAS: Abrupt onset of OCD and/or tics following Group A strep; prepubertal; episodic course with strep-linked exacerbations; molecular mimicry (anti–basal ganglia antibodies)
PANS: Broader category — same phenotype, not limited to strep trigger (mycoplasma, viral, other immune)
Treatment: Antibiotics for strep; IVIG/plasmapheresis in severe cases; standard tic/OCD medications

Drug-Induced Tics

Stimulants: Methylphenidate, amphetamines — may unmask pre-existing tic tendency
Cocaine, methamphetamine: Dopaminergic excess → tics and stereotypies
Withdrawal tics: Sudden cessation of dopamine blockers (neuroleptic withdrawal-emergent tics)

Structural & Neurodegenerative

Stroke or TBI involving basal ganglia or frontal cortex
Huntington disease: Tics may be early feature, especially juvenile-onset HD
Neuroacanthocytosis: Tics + chorea + lip/tongue biting; acanthocytes on smear
Encephalitis: Post-encephalitic tics (viral, autoimmune including anti-NMDAR)

Clinical Pearl

Abrupt explosive onset of tics + OCD in a prepubertal child after sore throat → PANDAS. Check ASO, anti-DNase B, throat culture.
Consider secondary causes when tics are atypical: adult onset, sudden onset, no premonitory urge, associated neuro signs, or no waxing/waning.

Functional (Psychogenic) Tics

Feature	Primary Tics (Tourette)	Functional Tic-Like Behaviors
Onset	Gradual, childhood (4–6 yr)	Abrupt, often adolescent/young adult
Premonitory urge	Present (>90%)	Typically absent
Suppressibility	Temporarily suppressible	No consistent suppressibility
Pattern	Waxes/wanes; type changes	Fixed, repetitive, stereotyped
Distraction	Tics may persist	Often resolve with distraction
Gender	Male predominance (3–4:1)	Female predominance
Coprolalia	<20%	Frequently present; complex phrases
Response to tic meds	Yes	Poor or absent

Management

Positive diagnosis based on functional features — not a diagnosis of exclusion
Treatment: Psychoeducation, CBT, physical therapy with motor retraining; avoid unnecessary dopamine blockers

💎 Board Pearl

No premonitory urge + abrupt onset + fixed pattern + female predominance + distractibility = functional tic-like behavior.
Functional tics do NOT respond to tic medications — dopamine blockers should be avoided.

References

Robertson MM, Eapen V, Singer HS, et al. Gilles de la Tourette syndrome. Nat Rev Dis Primers. 2017;3:16097.
Pringsheim T, Okun MS, Müller-Vahl K, et al. Practice guideline recommendations summary: treatment of tics in people with Tourette syndrome and chronic tic disorders. Neurology. 2019;92(19):896-906.
Piacentini J, Woods DW, Scahill L, et al. Behavior therapy for children with Tourette disorder: a randomized controlled trial. JAMA. 2010;303(19):1929-1937.
Leckman JF, Zhang H, Vitale A, et al. Course of tic severity in Tourette syndrome: the first two decades. Pediatrics. 1998;102(1):14-19.
Swedo SE, Leonard HL, Garvey M, et al. Pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections. Am J Psychiatry. 1998;155(2):264-271.
Pringsheim T, Holler-Managan Y, Okun MS, et al. Comprehensive systematic review summary: treatment of tics in people with Tourette syndrome and chronic tic disorders. Neurology. 2019;92(19):907-915.
Müller-Vahl KR, Sambrani T, Jakubovski E. Tic disorders revisited: introduction of the term “functional tic-like behaviors.” Mov Disord Clin Pract. 2022;9(8):1076-1084.
Martino D, Pringsheim TM. Tourette syndrome and other chronic tic disorders: an update on clinical management. Expert Rev Neurother. 2018;18(2):125-137.