Tic Disorders
Tics are sudden, rapid, repetitive and non-rhythmic movements or vocalisations. Examples are eye blinking, head shaking, shoulder shrugging, throat clearing, or a short sound. Their intensity and form often change over time: they may increase for weeks and then subside, move to another part of the body, or appear more with stress and fatigue.
Tics are not a conscious "bad habit." Many people experience an uncomfortable premonitory urge before a tic and can suppress it briefly, usually with effort and a subsequent increase in the urge. Others, especially younger children, do not yet recognize this sensation. Treatment is indicated when tics cause pain, injury, functional impairment, or personal distress—not merely because they are visible.
What Are Tic Disorders?
The DSM-5-TR distinguishes Tourette Disorder, Persistent Motor or Vocal Tic Disorder, and Provisional Tic Disorder. In Tourette's there have been multiple motor and at least one vocal tic, not necessarily at the same time, and the course lasts more than a year from the first tic. In the persistent form there are motor or vocal tics, but not both, for more than a year. In the provisional form, motor and/or vocal tics are present for less than a year.
Possible motor and vocal tics
Tics can be simple or more complex and change over time:
- Eye blinking, grimacing, nose or mouth movement, head shaking and shoulder shrugging.
- Sudden arm or trunk movements, touching objects, jumping or short sequences of movements.
- Clearing throat, snorting, coughing, grunting, small screams or other short sounds.
- Words or phrases may appear in complex vocal tics. Involuntary utterance of socially inappropriate words is in the minority and not necessary for Tourette's.
- Warning sensation of pressure, itching, or need that temporarily subsides after the tic, especially in older children and adults.
- Pain, headache, injury, disruption of writing or speaking, difficulty sleeping, or social burden from teasing and attempted suppression.
How It Is Diagnosed
Diagnosis is made clinically by history and observation. Home video can help when the tic doesn't show up in the doctor's office. Form, duration since first tic, medications, functional impact and co-occurring needs are considered.
- In Tourette's Disorder, multiple motor tics and one or more vocal tics have occurred at some point, although not necessarily at the same time.
- In Persistent (Chronic) Motor or Vocal Tic Disorder, motor or vocal tics are present, but not both, and the criteria for Tourette's Disorder have never been met.
- In Tourette's Disorder and Persistent (Chronic) Motor or Vocal Tic Disorder, tics may fluctuate but persist for more than 1 year after the first tic. In Provisional Tic Disorder, tics have been present for less than 1 year.
- For all three disorders, onset is before age 18 and the disturbance is not attributable to a substance, medication, or another medical condition.
Provisional Tic Disorder also requires that the criteria for Tourette’s Disorder or Persistent (Chronic) Motor or Vocal Tic Disorder have never been met. Later remission or a change in tic type does not reset this history.
How can they affect everyday life?
Many tics are mild and not life-threatening. But trying to suppress constantly in class or at work can exhaust attention and lead to more tics in a safe environment. Teasing and disciplinary remarks for involuntary movements often cause more damage than the tic itself. For some, obsessive-compulsive symptomatology, Attention-Deficit/Hyperactivity Disorder (ADHD), anxiety, or anger affect functioning more and should be treated as equal needs.
Causes and factors affecting tics
Tic Disorders have a complex neurodevelopmental and genetic basis, with no single gene or test predicting the diagnosis. Prenatal and perinatal factors have been associated in studies with risk or severity, but the associations do not prove that they caused the tics in a child. Stress, excitement, fatigue, and attention to the tic may temporarily change the frequency, but they are not the root cause. Families are not responsible because the child has tics.
What else might look like a tic
The distinction is based on the quality of the movement, the context and the time course:
- Stereotypic movements are often more rhythmic, prolonged, and predictable, begin earlier, and may be associated with excitement or self-regulation.
- Tics may be preceded by a premonitory sensory urge that is temporarily relieved by the tic; this experience is not universal.
- Dystonia, myoclonus, chorea, seizures, and functional movements have different motor characteristics and may require neurologic evaluation.
- Cough, allergy, asthma, or gastroesophageal reflux may mimic a vocal tic and require medical exclusion.
- ADHD stimulants generally do not worsen tics on average and can be used when indicated, with individualised monitoring.
Treatment and Support
The decision for treatment is based on the functional burden and the individual's own priorities:
- Explain that tics are involuntary. Avoid repeatedly correcting or reprimanding the person for tics, and address teasing or bullying.
- Observation without active treatment is acceptable when there is no functional impact and the person does not desire intervention.
- CBIT teaches awareness of tics and premonitory urges, use of a competing response, and changes to situations that worsen tics.
- Medications may be considered when the benefit outweighs the risk. Certain medications that modulate the adrenergic system can also help ADHD, while antipsychotics can reduce tics but require monitoring for motor, metabolic, and hormonal side effects.
- Treating co-occurring difficulties, such as ADHD, obsessive-compulsive symptoms, anxiety, sleep, and depression, may improve daily functioning more than focusing solely on tics.
When to Seek Help
Seek evaluation when tics cause pain, injury, difficulty learning, speaking, or sleeping, or when the child experiences teasing and avoids activities. Also get help for severe anxiety, compulsions or attention problems. Sudden onset of atypical movements after a new drug, infection, or neurological symptom needs medical evaluation and should not automatically be classified as a tic.
Frequently Asked Questions
Can a person hold back tics?
Often temporarily, but with effort and discomfort. Suppressibility does not mean that the tic is voluntary, and constant demands to "stop" may increase the intensity.
Does everyone with Tourette's say inappropriate words?
No. Unintentional utterance of socially inappropriate words occurs in a minority and is not a necessary criterion. Tourette's requires multiple motor and at least one vocal tic.
Do ADHD stimulant medications worsen tics?
The best studies show that, on average, common stimulants don't make tics worse. Treatment still requires individual monitoring because tics fluctuate over time.