Psychoanalytic epistemology considers psychosis to be linked to the resurgence of traumatic experiences that have not been assimilated by subjectivity. The hallucinatory return of this primitive agony faces the psychotic subject with a driving encroachment that attacks his body and disintegrates its unitary organisation. Considering this reliving of traumatic experiences, the authors will present schizophrenic delusion less as a pathological result than as a subjective response that aims to treat the psychic over tension, which fractures the subject's body identity. Based on several clinical studies, this article will question the healing effect of delusion in schizophrenia. It is therefore concerned with investigating the different functions of delusion and identifying their incidence on the subject's body image. Using the different clinical examples cited, the authors will then attempt to develop certain therapeutic applications, which contribute to a possible reduction of the body disintegration phenomena in schizophrenia.