These careful studies suggest that most children with ADHD have tics at some point in their life.
 

References

  1. Cavanna AE, Servo S, Monaco F, Robertson MM: The behavioral spectrum of Gilles de la Tourette syndrome. J Neuropsychiatry Clin Neurosci 2009; 21:13-23. DOI: 10.1176/jnp.2009.21.1.13
  2. Black KJ, Black ER, Greene DJ, Schlaggar BL: Provisional Tic Disorder: What to tell parents when their child first starts ticcing [version 1; referees: 3 approved]. F1000Res 2016; 5:696. DOI: 10.12688/f1000research.8428.1
  3. Law SF, Schachar RJ: Do typical clinical doses of methylphenidate cause tics in children treated for attention-deficit hyperactivity disorder? J Am Acad Child Adolesc Psychiatry 1999; 38(8):944-951. DOI: 10.1097/00004583-199908000-00009
  4. Bihun EC, Iverson A, Ranck SA, Grossen S, Ding J, Greene DJ, Black KJ: Tic prevalence by direct observation in an elementary school. OSF Preprints 2022–2024. DOI: 10.31219/osf.io/bv86n
  5. Spencer T, Biederman M, Coffey B, Geller D, Wilens T, Faraone S: The 4-year course of tic disorders in boys with attention-deficit/hyperactivity disorder. Arch Gen Psychiatry 1999; 56(9):842-847. DOI: 10.1001/archpsyc.56.9.842
  6. Amiri S, Fakhari A, Golmirzaei J, Mohammadpoorasl A, Abdi S: Tourette's syndrome, chronic tics, and comorbid attention deficit/hyperactivity disorder in elementary students. Arch Iran Med 2012; 15(2):76-78. 
  7. Poh W, Payne JM, Gulenc A, Efron D: Chronic tic disorders in children with ADHD. Arch Dis Child 2018; 103(9): 847–852. DOI: 10.1136/archdischild-2017-314139
  8. Comings DE, Comings BG. Tourette's syndrome and attention deficit disorder with hyperactivity: are they genetically related? J Am Acad Child Psychiatry 1984; 23:138-146. DOI: 10.1097/00004583-198403000-00004
  9. Comings DE, Himes JA, Comings BG: An epidemiologic study of Tourette's syndrome in a single school district. J Clin Psychiatry 1990; 51:463-469. PubMed PMID: 2228981