Between 2 and 3% of the population would have obsessive compulsive disorders or TOCreports theINSERM. Guillaume Canet, Nicolas Bedos, Katy Perry… The stars are no exception and some have confided in the press about their intrusive and uncontrollable behavior or thoughts. These disorders are characterized by the presence of obsessions and/or compulsive behaviors often centered on cleanliness, tidiness, order, symmetry or the repetition of rituals.