Tourette’s and OCD: Why They So Often Appear Together

When tics and obsessions share the same brain circuits, the line between them can blur. Understanding where Tourette’s ends and OCD begins changes how both should be treated.

In specialist clinic samples, roughly half of all people diagnosed with Tourette’s syndrome also meet criteria for obsessive-compulsive disorder at some point in their lives. That is not a coincidence. These two conditions arise from overlapping brain circuits, and in some people, the symptoms become so entangled that even experienced clinicians need time to separate them.

In clinical practice, I see this regularly. A person arrives seeking help for intrusive thoughts and rituals, and it becomes clear that tics have been present since childhood but were never identified. Or a young person with a Tourette’s diagnosis begins developing compulsive behaviours that do not quite fit the usual OCD profile. The overlap is far more common than most people realise, and recognising it early makes a significant difference to treatment.

How Common Is It to Have Both Tourette’s and OCD?

The most comprehensive study to date comes from Hirschtritt and colleagues, who examined over 1,300 people with Tourette’s syndrome recruited through specialist genetics clinics. They found that 50% met criteria for lifetime OCD, 54.3% for ADHD, and 72.1% for at least one of these two conditions. These are specialist-sample figures, so they likely overestimate what you would find in the general population. But even in broader studies, reviews consistently report OCD in roughly 40 to 50% of people with tic disorders, with the exact figure depending on how the sample was recruited and how OCD was defined.

Looking at it from the other direction, estimates suggest that between 15% and 30% of people diagnosed with OCD also have a history of tics, though again, the range reflects differences in study design and sample type.

If you have been diagnosed with one of these conditions and suspect the other might be present, that instinct is worth following up. The overlap between ADHD and tics adds another layer, as all three conditions frequently travel together. For people who carry both ADHD and autism diagnoses alongside tics, the clinical picture becomes even more layered, something explored in more detail in our piece on AuDHD.

Is This a Tic or a Compulsion?

This is the question that sits at the centre of the Tourette’s-OCD overlap, and it is the one that people living with both conditions find most confusing. The answer matters, because the treatment for a tic is different from the treatment for a compulsion.

What a Tic Feels Like

A tic is a sudden, repetitive movement or sound that is typically preceded by a premonitory urge. That urge is often described as a physical tension, an itch that builds until the tic is performed, at which point there is a brief sense of relief. The important thing to understand is that this is a sensory experience. It is not driven by a thought. There is no feared consequence attached to it. You do not blink repeatedly because you believe something bad will happen if you stop. You blink because the urge to blink has become overwhelming.

What a Compulsion Feels Like

A compulsion, by contrast, is usually performed in response to an intrusive thought or obsession. You check the lock because you fear an intruder. You wash your hands because the thought of contamination causes intense anxiety. The behaviour is an attempt to neutralise a specific fear, and the relief that follows is tied to the temporary reduction of that anxiety.

If you are unfamiliar with how OCD presents more broadly, the core pattern is this cycle of intrusive thought, rising anxiety, and a ritual performed to bring the anxiety down.

When It Could Be Both

The boundary between tics and compulsions breaks down when a behaviour has qualities of both. Imagine someone who taps a surface repeatedly, not because they fear something will happen, but because it does not feel “just right” until they have done it a specific number of times. That is not a classic tic, because there is a cognitive element. But it is not a classic compulsion either, because there is no intrusive fear driving it. The behaviour sits in the grey area between the two.

Researchers have used the term “compulsive tics” to describe exactly these presentations. Palumbo and Kurlan, writing in 2007, noted that some repetitive behaviours in people with Tourette’s are “virtually impossible to classify as a tic or a compulsion.” That observation has been borne out repeatedly in clinical practice. It is also worth noting that repetitive behaviours in autistic people, often called stimming, serve a different function again, primarily sensory regulation rather than urge release or anxiety reduction.

Tic, Compulsion, or Tourettic OCD?

The following table is a simplification, but it captures the broad pattern. In reality, individual experiences vary considerably.

What Is Tourettic OCD?

Tourettic OCD is not a formal diagnosis in the DSM-5 or ICD-11. It is a clinical label used by specialists to describe a distinct presentation that sits between Tourette’s and OCD. The concept is most strongly associated with the work of Miguel, Leckman, and Kurlan, whose research showed that people with tic-related OCD experience significantly more sensory phenomena and “just right” experiences than people with OCD alone.

What Does It Look Like in Practice?

In practical terms, Tourettic OCD tends to involve repetitive behaviours driven by a need for symmetry, ordering, or evening things up, accompanied by strong sensory discomfort rather than catastrophic fears. A person might need to touch both sides of a doorframe before walking through it, not because they believe something terrible will happen, but because not doing so produces an unbearable sense of incompleteness.

A 2022 review by Szejko and colleagues described Tourettic OCD as a “unique endophenotype” with features of both tics and compulsions, noting that it typically requires a combined treatment approach. Recognising this presentation matters because standard OCD treatment protocols, which focus heavily on challenging feared outcomes, may need adapting when the driving force is sensory discomfort rather than fear.

Why Do Tourette’s and OCD Share the Same Brain Circuits?

Both Tourette’s and OCD involve dysfunction in what neuroscientists call cortico-striatal-thalamo-cortical circuits. These are loops of neural activity that connect the frontal cortex, the basal ganglia, and the thalamus. They help regulate which actions get performed and which get suppressed, which urges get acted on and which get filtered out.

Different Loops, Same Neighbourhood

In Tourette’s, the disruption tends to occur in the motor and sensorimotor loops of these circuits, which is why the primary symptoms are involuntary movements and sounds. In OCD, the disruption is more commonly found in the orbitofrontal and ventral striatal loops, which are involved in decision-making, error detection, and anxiety regulation.

These circuits run through many of the same structures, particularly the basal ganglia. Dysfunction in one loop can spill into the other. This shared neural territory explains why a person can have both tics and obsessive-compulsive symptoms, and why the symptoms can be difficult to disentangle. It is the same shared circuitry that contributes to the overlap between ADHD and OCD, and between autism and tics.

Which Comes First, and Does It Matter?

In many cases, tics appear first. The Hirschtritt study found a median age of onset for Tourette’s of six years. OCD symptoms tend to emerge somewhat later, though there is considerable overlap. This developmental sequence is clinically important because it means that for many people, tics are the first visible sign of the underlying neurodevelopmental difference.

When OCD Becomes the Bigger Problem

Tic severity often peaks in late childhood or early adolescence and then declines, sometimes quite significantly. OCD, on the other hand, tends to persist and can become more disabling over time. This is why many adults present with OCD as their primary concern, even though tics were the original problem years earlier. The tics may have faded or become manageable. The obsessive-compulsive symptoms have not.

For parents of children with Tourette’s who begin to notice new rituals or rigid behaviours, this pattern is worth being aware of. The emergence of OCD alongside existing tics does not mean something has gone wrong with treatment. It reflects the natural developmental trajectory of the shared neurobiology.

What Does the Research Say?

The co-occurrence of Tourette’s and OCD has been studied extensively. Hirschtritt and colleagues (2015) published the largest comorbidity study to date in JAMA Psychiatry, examining 1,374 individuals with Tourette’s syndrome recruited through specialist clinics. They found lifetime OCD in 50%, ADHD in 54.3%, and at least one of these conditions in 72.1% of participants.

Miguel and colleagues (1997, 2003) demonstrated that people with tic-related OCD report significantly more sensory phenomena, including premonitory urges and “just right” experiences, than those with OCD alone. This body of work, conducted across multiple centres, established the phenomenological basis for the Tourettic OCD concept.

Palumbo and Kurlan (2007) examined the overlap between compulsive and impulsive symptoms in Tourette’s, identifying a subset of repetitive behaviours that could not be cleanly classified as either tics or compulsions. They coined the term “compulsive tics” and argued that these mixed presentations require tailored treatment.

Szejko and colleagues (2022) published a comprehensive review in Frontiers in Psychiatry, describing Tourettic OCD as a distinct endophenotype with specific treatment implications. They noted that combined behavioural and pharmacological approaches are typically necessary for full symptom management.

On treatment, the European clinical guidelines for Tourette syndrome (Roessner et al., 2022) and the American Academy of Neurology practice guidelines (Pringsheim et al., 2019) both support behavioural interventions as first-line treatment for tics, with pharmacological options reserved for cases where impairment is significant. NICE guideline CG31, which covers OCD treatment in the UK, recommends CBT with ERP as first-line therapy, with SSRIs as an alternative or adjunct.

How Are Tourette’s and OCD Treated When Both Are Present?

When both conditions are present, treatment is typically individualised. The starting point is working out which symptoms are causing the most impairment, and whether those symptoms are better understood as tics, compulsions, or a mixture of both.

Behavioural Approaches

Exposure and Response Prevention (ERP) remains the first-line behavioural treatment for OCD, including in people who also have tics. The core principle, gradually facing feared situations without performing the compulsive behaviour, still applies. But when the OCD presentation is more Tourettic, clinicians often need to adapt the approach to target sensory discomfort and “just right” urges rather than focusing exclusively on feared outcomes.

For tics themselves, the first-line behavioural treatment is Comprehensive Behavioural Intervention for Tics (CBIT), which includes habit reversal training. This involves learning to recognise the premonitory urge and performing a competing response until the urge passes. CBIT and ERP can be used alongside each other when both tics and OCD are present, though the clinician needs to be clear about which behaviours are being treated with which approach.

Medication

SSRIs are the standard medication for OCD. However, some clinical reviews suggest that tic-related OCD may respond less robustly to SSRI monotherapy than OCD without tics. When that appears to be the case, augmentation with a low-dose antipsychotic such as aripiprazole is sometimes considered.

For tics, the main medication classes are alpha-2 agonists (such as clonidine or guanfacine) and dopamine-blocking agents. The choice depends on the severity of the tics, the person’s broader symptom profile, and how the medication interacts with anything already being prescribed for OCD.

Do I Need Separate Therapists for Tics and OCD?

Not necessarily. A psychiatrist or psychologist with experience in neurodevelopmental conditions can often manage both within the same treatment plan, particularly when the presentation involves overlapping tics, compulsions, and attentional difficulties. The key is working with a clinician who understands the distinction between tics and compulsions and can adapt exposure-based approaches accordingly. Having both conditions does not necessarily mean more complicated treatment. It means more precise treatment.

Getting the Right Support

At The Private Therapy Clinic, we work with adults and young people who are living with Tourette’s syndrome, OCD, or both. Our psychiatrists and psychologists understand the overlap between these conditions and can provide the kind of nuanced assessment that distinguishes tics from compulsions and identifies when a combined treatment approach is needed. If you are unsure where to start, we offer a free 15-minute consultation to help you explore your options and find the right path forward.