Distinguishing Tics from Extrapyramidal Symptoms

Core Distinguishing Features of Tics

Tics have five cardinal features that fundamentally differentiate them from EPS, including suppressibility, which allows patients to temporarily suppress tics voluntarily, though this is followed by intensification of the premonitory sensation, as noted by the American Academy of Neurology 1, 2
Tics diminish when attention is diverted elsewhere, and can be modified by suggestion, as reported by the American Thoracic Society 3, 2
The repertoire of tics changes over time with a characteristic waxing-waning pattern that fluctuates over weeks to months, according to the American Academy of Neurology 1, 2

Simple motor tics, such as eye blinking, facial grimacing, head jerking, and shoulder shrugging, are common presentations of tics, as described by the American Academy of Neurology 1, 2
Simple phonic tics, including throat clearing, sniffing, grunting, coughing, squeaking, and barking, are also characteristic of tics, as noted by the American Academy of Neurology 1, 2
Complex tics involve stereotyped movements involving multiple muscle groups, as reported by the American Academy of Neurology 2

The presence of suppressibility and premonitory sensation strongly suggests tics, according to the American Academy of Neurology 1, 2
The absence of these features suggests EPS or other movement disorders, although this is not exclusively supported by cited references

The American College of Chest Physicians recommends against using terms like "habit cough" or "psychogenic cough" and instead using "tic cough" to align with DSM-5 classification, as stated in the CHEST guidelines 3, 4, 5
The American Academy of Neurology advises against performing excessive medical testing for tics, as diagnosis is primarily clinical and unnecessary testing causes iatrogenic harm 1

Tics typically onset around age 7 years, with boys affected more commonly than girls, approximately 1 per 1,000 male children, as reported by the American Academy of Neurology 1, 2
Nearly half of tic patients experience spontaneous remission by age 18, according to the American Academy of Neurology 1

For tics, treatment focuses on behavioral interventions first, with neuroleptics reserved for severe cases, as recommended by the American Academy of Neurology 6