The convergence of obsessive and schizophrenic symptoms, particularly the blending of obsessional and delusional features into complex symptoms, calls for a clarification of the relationship between obsessions and delusions, which are usually thought of as separate and distinct, even opposite entities. This brief review is a preliminary attempt to assess some of the difficult issues raised by these phenomena.
We evaluate obsessions and delusions, and how they may overlap. A patient's degree of insight has been deemed a determining factor in distinguishing between these primary symptoms. However, our review of the literature shows that a definite distinction between obsessions and delusions cannot be made solely on the basis of insight.