Symptomatology of Late‐onset Schizophrenia and Paranoid Disorders

: There is controversy concerning the classification of late‐onset paranoid disorders, but many interpret it as schizophrenia that is first manifested in old age. As a result of the revival of the concept of late‐onset catatonia in recent years, the classification of late schizophrenia has been reorganized. Late‐onset paranoid disorders have two characteristics in terms of their symptomatology: a transition from the boundaries of the self to material boundaries, and delusions of injury. In late‐onset paranoid disorders there is adherence of the boundaries of the self to physical boundaries in an external form that can be seen with the eyes. Delusions of injury, in which living space within physical boundaries is infringed, become manifestations, such as delusions of robbery, jealousy, and delusions of infestation.