The prevalence of Tourette Syndrome varies widely depending on the studies that are consulted, locating itself between 50/10,000 to 300/10.000. In many cases the symptoms are slight and they do not consult the doctor, reason why it is probable that the real prevalence would be more elevated.
Between the 5 and 23% of the children will present  tics before the puberty and this symptom is  the reason for  the 50% of consultations to the specialist centers. It is more frequent in girls than in boys (3/1).
It has a hereditary component. The risk for the first degree relatives of suffering the upheaval is of 50%, or around 200 times the prevalence of the general population. Although the upheaval is transmitted genetically equal by mothers and parents, can have differences in the clinical presentation. The implied gene or genes has not been identified yet .