Tic disorder is characterized by sudden, involuntary contractions of small muscle groups in the face, throat, and shoulders. It can be caused by psychogenic factors like stress, neurogenic complications of encephalitis, or substance abuse. Symptoms include motor tics like eye blinking or twitching, vocal tics like throat clearing or grunting, as well as issues like learning difficulties or hyperactivity. Tic disorder is managed through drug therapy using antipsychotics or other medications, as well as behavioral therapy and counseling.