Tic disorder, also known as Tourette’s syndrome, is a syndrome characterized by multiple involuntary jerks and language or behavioral disturbances. The syndrome usually develops between the ages of 3 and 15 years, with more males than females in a ratio of (3-4):1. It is characterized by brief, rapid, sudden, involuntary movements of varying degrees, beginning with frequent blinking, eyebrow squeezing, nasal aspiration, and mouth pouting. It starts with frequent blinking, eyebrow squeezing, nose sucking, mouth pouting, mouth opening, tongue stretching and head nodding. As the disease progresses, the twitching gradually diversifies, alternating with shrugging, neck twisting, head shaking, leg kicking, hand flinging or limb twitching, etc. The symptoms are often more pronounced during emotional stress or anxiety, and disappear after sleep. Vocal tics are often of various kinds, with explosive repeated vocalizations, clear noise and grunts, individual syllables, unclear words and phrases, improper stress or constant obscene speech, and an impatient, capricious and irritable personality. It is often accompanied by inattentiveness in class or a decline in grades. In severe cases, the movements and pronunciation interfere with learning and classroom order. The symptoms of tic disorder are fluctuating, progressive and chronic in course. According to the American Diagnostic and Statistical Manual of Mental Disorders, tic disorders are classified into four categories: 1. transient tic disorder; 2. chronic tic disorder; 3. Tourette’s syndrome; 4. other tic disorders that have not been defined.