Tic
A tic is a sudden, repetitive, nonrhythmic motor movement or vocalization involving discrete muscle groups. Tics can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic tics are, respectively, eye blinking and throat clearing.
Tic
Individuals with obsessive–compulsive disorder (OCD) may present with features typically associated with a tic disorder, such as compulsions that may resemble motor tics. "Tic-related OCD" is hypothesized to be a subgroup of OCD, distinguished from non-tic-related OCD by the content and type of obsessions and compulsions; individuals with tic-related OCD have more intrusive thoughts, and exhibit more hoarding and counting rituals than individuals with non-tic-related OCD.