Billie eilish has mentioned have tourettes in this screenshot taken from her ig page.
notice the part that says her tics are only physical and not super noticable, well in order to be diagnosed with tourettes a person must have both motor and vocal tics. here are three sources to verify this.
https://www.mayoclinic.org/diseases-conditions/tourette-syndrome/diagnosis-treatment/drc-20350470
https://www.cdc.gov/ncbddd/tourette/diagnosis.html
https://tourette.org/about-tourette/overview/diagnosis/
so what do you guys think discuss.