Answer by  
                                                                                          sarsie1 (92)
                                                            
                          
                          
                                                          Nervous tics are sometimes associated with a medical disorder known as Tourette's Syndrome.  Tourette's Syndrome requires both a verbal tic and a movement tic to quality.  Tics that do not meet the Tourette's Syndrome qualifications are usually termed "nervous tics" and include several activities including blinking, cracking knuckles, or peeling labels.