This work aims to study the relationship between psychopathology and deafness. These results show that the most frequent diagnosis among the deaf are disorders of mood and post-traumatic syndrome. Psychotic disorders and mental retardation, once widely diagnosed among deaf populations, are less frequent. The accuracy of these findings results from studies conducted by a team that is specialized in the care of the deaf and that also masters the socio-linguistic aspects of the deaf culture. The high prevalence of erroneous diagnosis posed by non-specialist teams in support of deaf persons, shows the need for the establishment of a bio-psycho-socio-specific language for the deaf.