Individuals with these disorders all suffer from tics, which are quick, nonrhythmic movements or vocalizations that happen over and over, and are not caused by some other disorder like Huntington's disease or substance abuse.

上述三种疾病的患者都有抽动症状，即快速、无规律的动作或发声；这种持续存在的抽动并不是其他疾病的并发症，纵然亨廷顿病、药物滥用等也会导致类似抽动的症状。