Abstract : Nowadays OCD are, from a diagnostic as well as mediatic viewpoint, a very trendy phenomenon; it is also interesting to note that it occurred together with the coming out of the SSRI. A danger however results of this state of things: on the one hand, the excessive medicalisation of troubles that mostly depend on a psychotherapic approach; on the other hand, the standardizing of a syndrome that, beyond its apparent unicity, encompasses very different psychopathologic entities, which have to be sorted out first, before choosing the most suitable therapeutic approach