Tourette syndrome and obsessive-compulsive disorder are usually introduced as two separate conditions that happen to share the letters OCD and the same general age of onset. The evidence does not support treating them as separate in practice. The largest study of the overlap found that most people with Tourette syndrome also meet criteria for OCD, ADHD, or both, and the two disorders appear to share a genetic relationship rather than merely co-occurring by coincidence.
Our overview of Tourette syndrome covers tics and the premonitory urge that drives them; this article is about what happens where that picture and OCD overlap.
How much overlap there actually is
A 2015 study examined 1,374 people with Tourette syndrome, the largest sample assembled for this question, and found that 72.1 percent met lifetime criteria for OCD, ADHD, or both. [hirschtritt-2015-comorbid] The study also found the two conditions cluster genetically within families, which is a different and stronger claim than simply noting they tend to appear together: it suggests a shared underlying vulnerability rather than one condition happening to make room for the other.
- OCD, ADHD, or both 72%
- Neither 28%
Hirschtritt et al. (2015), n=1,374 people with Tourette syndrome. Category labels are ours; the overlap percentage is theirs.
Both conditions also tend to emerge in the same narrow window of childhood, which the same study identified as the period of greatest risk for either one appearing. A family managing early tics is statistically likely to also be in the early window for OCD, whether or not anybody has named it yet.
The compulsion that belongs mostly to this overlap
The more clinically useful finding sits inside that overlap rather than beside it. [leckman-1994-just-right] asked people with tic disorders about a specific kind of internal experience: needing an action, sensation, or arrangement to feel exactly right before they could stop.
Eighty-one percent of people with both Tourette syndrome and OCD reported this. It was reported far less often by people with tic-related OCD symptoms alone, and it typically concerned visual or tactile qualities, how something looked or felt, rather than sound. This is sometimes described in the clinical literature as a “just right” compulsion, and while it is not a formal diagnosis, it is common enough and distinct enough that researchers treat it as its own recognisable pattern rather than ordinary OCD that happens to co-occur with tics.
Why it gets misread in both directions
The practical problem is that a “just right” compulsion is genuinely hard to tell from a tic by looking at it, and the standard OCD framework does not fit it cleanly either.
| Ordinary tic | ”Just right” compulsion | Ordinary OCD compulsion | |
|---|---|---|---|
| What precedes it | A premonitory urge, a physical tension | A sense that something is not right | A specific fearful thought |
| What it is trying to do | Release the physical tension | Make a sensation feel complete | Prevent a feared outcome |
| What ends it | The movement itself | The state finally feeling right | Confidence the feared outcome is prevented |
| Deliberateness | Often minimal conscious planning | Deliberate, sometimes repeated many times | Deliberate, tied to the specific fear |
A parent, teacher, or even a first clinician can reasonably read a “just right” straightening or repeating action as either a slightly unusual tic or as textbook OCD, and be only partly right either way. The distinguishing information is not what the behaviour looks like from outside; it is what the person reports feeling before and during it, which requires asking rather than observing.
Is this closer to a tic or a compulsion?
Think about one specific repeated behaviour. Tick what is true of it. This is a reflection prompt rather than a test, and it does not replace an assessment.
0 of 5 ticked
A mix of urge-driven and completion-driven features, without a clear feared outcome attached, is the pattern this article describes. It is worth describing to a clinician in exactly these terms rather than only naming the visible behaviour.
A cleaner tic or a cleaner fear-driven compulsion still benefits from an accurate description, since the two respond to different approaches. Note which features were present and which were not.
That is fine. A single behaviour is not always classifiable in isolation, and a clinician will usually ask about a pattern across several rather than one instance.
No screener on this site distinguishes tics from compulsions. The hub above covers anxiety, depression, stress, sleep, burnout, self-esteem and loneliness.
What this does not establish
Comorbidity figures describe a population, not a certainty for any one person. Roughly a quarter of people with Tourette syndrome in the largest study met criteria for neither OCD nor ADHD, so the overlap being common does not make it universal.
The genetic relationship identified between the two conditions does not mean either one directly causes the other, only that a shared vulnerability appears to run in families alongside both.
And the “just right” pattern, while common in this specific overlap, is a description drawn from clinical and research literature rather than a diagnostic category with its own formal criteria, so it is a useful way to describe an experience rather than a label a clinician will write on a chart.
What helps
Describe the internal experience, not just the behaviour. “It has to feel right” and “I’m afraid something bad will happen” point a clinician toward different, better-fitting treatments. Neither is obvious from watching the behaviour alone.
Ask specifically about the overlap at assessment. Given how common comorbidity is, an evaluation for tics that never asks about OCD symptoms, or the reverse, is incomplete more often than it is complete.
Expect that treatment may need to address both. Habit reversal training and exposure and response prevention target different mechanisms, and a behaviour with features of both may need a clinician who can judge which framework actually fits it.
Watch the same early window for both. Since the two conditions tend to emerge in the same childhood period, a family already managing early tics is well placed to also notice early compulsive patterns, rather than treating a second diagnosis as a surprise years later.
When to seek help
Speak to a doctor if tics or repetitive behaviours are affecting daily functioning, school, or family life, and describe both what the behaviour looks like and what precedes it internally, as fully as you or your child can. Given how often the two conditions occur together, ask directly whether an assessment covers both rather than assuming one evaluation rules out the other condition.
If you are having thoughts of harming yourself, treat that as urgent and contact your local emergency services or a crisis helpline.
How MyFreud can help
MyFreud is useful for tracking a repetitive behaviour alongside what precedes it and how it resolves, which is exactly the distinction that separates a tic from a “just right” compulsion. A pattern noticed over weeks, described in those specific terms, is more useful to a clinician than a single description recalled from memory.
Download MyFreud and start today: App Store or Google Play.