 Questions remain regarding how best to classify Tourette syndrome, and how closely Tourette's is related to other movement disorders or psychiatric disorders.Good epidemiologic data is still lacking, and available treatments are not risk free and not always well tolerated.The first presentation of Tourette syndrome is thought to be in the 15th-century book "Malleus Maleficarum" ("Hammer of Witches"), which describes a priest whose tics were "believed to be related to possession by the devil".