Both involve sudden, rapid, recurrent, nonrhythmic motor and/or vocal tics; the disorders are distinguished almost entirely by duration and course rather than tic type.
Both must begin before age 18; Provisional Tic Disorder is often the initial presentation before it either resolves or evolves into a persistent form.
Provisional Tic Disorder is diagnosed when tics have been present for less than 12 consecutive months; Persistent (Chronic) Tic Disorder requires tics (motor or vocal, not both) present for more than 12 months.
Both can fluctuate in frequency and severity, be temporarily suppressed, and be preceded by a premonitory urge; the two disorders differ mainly in whether the 1-year threshold has been crossed.
Impairment depends more on tic severity and social context than on duration category itself, though a persistent course carries more chance for social and self-esteem impact over time.
Neither is diagnosed if criteria for Tourette's Disorder are met (which requires both multiple motor and at least one vocal tic, persistent >12 months), or if tics are due to a substance or another medical condition.
The key differential question is simply: has it been more or less than 12 months, and has the case ever met the combined motor-plus-vocal criteria for Tourette's Disorder?
Families and clinicians sometimes assume any tic lasting a few months must be 'permanent Tourette's,' when many childhood tics are provisional and resolve within the first year.
An 8-year-old with eye-blinking and throat-clearing tics for 4 months has Provisional Tic Disorder by definition; if the same tics are still present, in modified form, 14 months later, the diagnosis shifts to Persistent Tic Disorder.
| Feature | Provisional Tic Disorder | Persistent (Chronic) Motor or Vocal Tic Disorder |
|---|---|---|
| Duration | Provisional Tic Disorder: less than 12 months | Persistent Tic Disorder: more than 12 months |
| Tic type required | Provisional Tic Disorder: motor and/or vocal tics | Persistent Tic Disorder: motor OR vocal tics (not both — that would be Tourette's) |
| Diagnostic stability | Provisional Tic Disorder: a working/interim diagnosis that may resolve or evolve | Persistent Tic Disorder: a more established course |
The presence of single or multiple motor and/or vocal tics, present for less than a year since first tic onset, distinguishing it from the longer-duration Persistent (Chronic) Motor or Vocal Tic Disorder and Tourette's Disorder.
One or more motor tics or vocal tics (but not both), present for more than a year since first tic onset, with onset before age 18 and not attributable to a substance or another medical condition.