[Migration, risks and opportunities].

The migration is considered for a long time as a risk for mental health, to which are exposed both migrants and their descendants. Indeed, the risk of developing schizophrenia, particularly, is multiplied by 2 to 3. Today, it is offending in the 'jihadist' terrorism that bruises in countries of immigration, including France. In fact, the majority of the perpetrators of deadly attacks come from the immigrant minority. We will show that the main common factor to both phenomenons is not migration but the social exclusion which is, unfortunately often linked to it. We will also show that this exclusion is as much the fact of the host society which advocates the cultural assimilation of immigrants as that of the migrant community, trapped by its cultural defector status and its conflict of loyalty. We conclude that migration is above all an opportunity for mutual enrichment if you advocate the integration, therefore, interculturality, that is an exchange reciprocal customs and values.