Published by Unseen Progress, an independent publisher of caregiver research. Last reviewed 2026-05-10. Part of the tic disorders research overview.
Short answer. Functional tic-like behaviour (FTLB) is a functional neurological condition that produces movements and vocalisations that superficially resemble tics but differ in onset age, phenomenology, premonitory experience, and treatment response. Most clinicians distinguish the two on a cluster of features: abrupt adolescent onset with no childhood history, complex movements and coprolalia from the start, near-absence of a classic premonitory urge, a high female-to-male ratio, and frequent links to anxiety, depression, and social-media exposure (Pringsheim et al., 2021; Heyman et al., 2021). The distinction matters because behaviour therapy designed for tics (CBIT) is not the first-line intervention for FTLB.
Before 2020, FTLB was rare enough that most general paediatricians had never seen a case. Beginning in mid-2020, specialist tic clinics across the UK, Germany, Canada, the US, and Australia reported an abrupt rise in adolescent — predominantly female — presentations with sudden, complex, often dramatic movements and vocalisations (Heyman et al., 2021; Pringsheim et al., 2021). The Tourette Association of America issued clinical guidance acknowledging the phenomenon in 2021. The clinical question for any parent now is no longer simply "is this Tourette?" but "is this Tourette, a provisional tic disorder, or FTLB?"
For context, classic primary tic disorders share a recognisable pattern (Leckman, 2002; Bloch & Leckman, 2009):
FTLB tends to present quite differently (Pringsheim et al., 2021; Heyman et al., 2021):
These features do not, individually, rule Tourette in or out. A child can have classic Tourette with comorbid anxiety. A young person can have FTLB layered on top of pre-existing mild tics. The distinction is made on the overall pattern, not any single feature.
The most damaging misreading of FTLB is that it is faked or attention-seeking. It is neither. Functional neurological symptoms are involuntary, distressing, and produce measurable changes in brain activity (Edwards et al., 2012). The young person is not in control of the movements in any moment-to-moment sense. The diagnostic label points to the mechanism — a functional rather than primary tic-generating one — and therefore to the treatment, not to whether the experience is genuine.
Clinicians who specialise in functional neurological disorder are explicit on this point: telling a young person their symptoms are "not real" worsens outcomes. The therapeutic message is that the symptoms are real, involuntary, and treatable through a different route than classic tic therapy.
In practice, the diagnostic process involves a careful history and observation rather than a single test. Specialist tic clinics (Heyman et al., 2021; Pringsheim et al., 2021) look at:
1. Onset trajectory. Childhood-onset simple tics that evolved over years point toward a primary tic disorder. Abrupt adolescent onset with full complexity from day one points toward FTLB. 2. Symptom pattern over a clinic visit. Classic tics often show waxing bouts with brief urge–discharge cycles. FTLB movements often shift in form mid-conversation, decrease with distraction, and have a different rhythmic quality. 3. Family history. A first-degree relative with tics raises the probability of a primary disorder. 4. Comorbidity profile. High anxiety, depression, and recent stressors weigh toward FTLB but do not exclude primary tics. 5. Premonitory experience. A clear, body-localised urge weighs toward primary tics.
A clinician unfamiliar with FTLB may default to a tic-disorder diagnosis on the surface presentation. A second opinion from a specialist tic or functional-neurology service is often valuable when the pattern is mixed.
Behaviour therapy for classic tics (CBIT) targets the premonitory urge with habit reversal (Woods et al., 2008; Piacentini et al., 2010). When the urge is absent or atypical, the mechanical work of habit reversal has nothing to attach to. Applied to FTLB, CBIT in its standard form has not shown the same effect.
The current consensus framework for FTLB (Pringsheim et al., 2021) emphasises:
For a parent navigating an unclear diagnostic picture:
1. Push for assessment by a clinician with specific FTLB experience if onset was sudden, adolescent, and complex from day one. General paediatric tic experience is not sufficient. 2. Resist the urge to "rule in or rule out" on a single feature. The diagnosis is a pattern call. 3. Treat the symptoms as real regardless of which label fits. Whichever way the diagnosis lands, the young person is not in voluntary control. 4. If FTLB is the working diagnosis, accept that the treatment path is different — and that classic tic resources may be unhelpful or actively counterproductive.
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