Tourette's Syndrome is an inherited, neurobehavioral disorder characterised by repeated and involuntary body movements (tics) and uncontrollable vocal sounds.
Diagnostic criteria include:
- Both multiple motor and one or more vocal tics present at some time, although not necessarily simultaneously;
- The occurrence of tics many times a day (usually in bouts) nearly every day or intermittently throughout the span of more than one year;
- Periodic changes in the number, frequency, type and location of the tics, and in the waxing and waning of their severity. Symptoms can sometimes disappear for weeks or months at a time.