Tic disorder

Disease Description (Causes and Symptoms)

• Definition summary: Tics are rapid, repetitive muscle movements (motor tics) or sounds (vocal tics) that occur without conscious control. When a person experiences both motor and vocal tics, this is called Tourette’s Disorder.
• Causes and pathophysiology: Abnormalities in the brain’s neurotransmitter systems, genetic predisposition, brain injury related to childbirth, and abnormal immune responses (e.g., post-infectious responses) are known to be associated. Symptoms may worsen due to stress, fatigue, or anxiety.
• Major symptoms: Eye blinking, facial grimacing, head or shoulder movements, sniffing, coughing sounds, and sounds made in the throat. Some people may have complex vocal tics (such as swearing). Symptom intensity and the areas affected fluctuate over time (a waxing and waning pattern).
• Prevalence (reference): Transient tic symptoms have been reported in 10–20% of school-age children; transient tics lasting more than 1 month (based on the reference data) are reported in approximately 5–15%, and chronic tic disorders lasting more than 1 year are reported in approximately 1%.

Treatment Methods and Precautions

• Non-pharmacological treatment
  • Education (for patients, families, and schools) and environmental adjustment: It is important not to point out or scold someone for their tics. Minimize stress, excessive academic demands, and insufficient sleep.
  • Behavioral therapy: Habit Reversal Therapy (HRT) and Comprehensive Behavioral Intervention for Tics (CBIT) are effective (particularly for mild to moderate symptoms or when combined with medication).
  • Relaxation therapy, stress management, and lifestyle improvement (regular sleep, rest, and exercise).
• Pharmacological treatment (for moderate or more severe symptoms or substantial functional impairment)
  • Medications considered first: α2 agonists (clonidine, guanfacine) — for mild to moderate symptoms or when ADHD is comorbid.
  • Dopamine antagonists (antipsychotic medications): risperidone, aripiprazole, etc. (with a substantial symptom-suppressing effect). Traditional medications (haloperidol, pimozide) are effective, but their side effects should be considered.
  • Other: VMAT2 inhibitors (e.g., tetrabenazine/deutetrabenazine) may be considered for use in some people (side effects and indications must be checked).
  • Medication selection is individualized according to symptom type, comorbid conditions (ADHD, OCD, etc.), and the side-effect profile.
  • Treatment duration: Although it varies depending on symptom improvement, treatment is generally maintained for several months to more than 1 year (example from clinical data: after maintaining treatment for 12–18 months, dose reduction may be considered).
• Testing and monitoring
  • Before and during medication treatment, monitoring of weight, mood changes, blood pressure, electrocardiogram (with certain medications, such as pimozide), and blood tests (metabolic and lipid tests) is necessary.
• Precautions and risk of complications
  • Medication side effects: Drowsiness, hypotension (α2 agonists), weight gain, metabolic abnormalities, extrapyramidal symptoms, and increased prolactin (antipsychotics), etc. Tetrabenazine-class medications may increase the risk of depression and suicidal thoughts.
  • Muscle pain caused by tics, social stigma and bullying, and declines in academic and social functioning may occur.
  • Because pointing out or punishing tic symptoms may worsen them, education for parents and teachers is important.

Outpatient Visit Checklist (Items and Records to Bring)

• Items/materials
  • List of currently used medications (including prescription and nonprescription medications and supplements), dosage, and dosing times
  • Previous medical records and test results (such as electrocardiograms and blood tests), as well as previous treatment history
  • Symptom diary (if possible, for 2–4 weeks): Type of tic (motor/vocal), time of occurrence, frequency, duration, aggravating factors (stress, insufficient sleep, exciting situations), and whether a premonitory urge is present
  • Impact at school and in daily life (changes in academic performance, relationships with friends, and teacher observation records)
  • Family history (tics, psychiatric disorders, and neurological disorders)
• Items that are useful to record at the outpatient visit (helpful during the consultation with the doctor)
  • Time of tic onset and course (fluctuation pattern)
  • Associated symptoms: ADHD symptoms (poor concentration, impulsivity), obsessive-compulsive symptoms, anxiety or depressive symptoms, and sleep problems
  • Whether there are thoughts of self-harm or suicide (particularly important to assess before starting medication)

Examples of General Questions to Ask the Doctor

• When is this medication expected to start working, and what is the next plan if it does not work?
• What are the main side effects of the medication, and what tests (such as an electrocardiogram or blood tests) are needed?
• What immediate measures can be taken at home when symptoms worsen?
• Is behavioral therapy (CBIT/HRT) available, and can you recommend places where it is available locally?
• If ADHD or OCD is also present, how will the treatment order or medication selection differ?

Examples of Condition-Specific Questions

• What adjustments are needed with the school to reduce the impact of our child’s tics on school life (classes and relationships with friends)?
• If medication treatment is started, when is symptom improvement expected, and what are the criteria for reducing or stopping the medication?

(Note: The diagnosis and treatment plan vary depending on each individual’s symptoms and comorbid conditions. For accurate evaluation and treatment, consult a specialist in child and adolescent psychiatry or neurology.)