The content aspect of delusions has been going through fast and great changes over the past hundred years. In this paper we would like to lead the reader through these changes with the brief overview of the related literature, thus giving a better understanding of the underlying causes. In recent years several studies have been published on the impact of technological and cultural changes in delusions, as opposed to the stability of delusional themes over longer periods of time, proved by long-term comparisons and comparative transcultural studies on delusions, allowing for only a certain degree of variability.